Message from the President

David A Friedman-PulseWelcome to The Pulse of Earthquake Engineering, the bi-weekly email newsletter of the Earthquake Engineering Research Institute.
— David A. Friedman, EERI President


Search The Pulse

News of the Institute

Register for the 11NCEE More >

2017 Shah Family Innovation Prize: Call for Nominations More >

Have You Renewed Your EERI Membership for 2018? More >

Learning from Earthquakes

Now Available: Webinar Recording from Mexico Earthquake Reconnaissance Briefing More >

In Memoriam - Mayor Ed Lee

In Remembrance of San Francisco Mayor Ed Lee More >

Member Spotlight

Resiliency Expert Louise Comfort Named ASCE Natural Hazards Review Co-Editor in Chief More >


DFI's 43rd Annual Conference: Deadline for Abstracts has been Extended to December 22, 2017 More >

Nominations for the Nigel Priestley International Prize 2018 are Now Open More >

2018 Fazlur R. Khan Distinguished Lecture Series More >

EERI Resources from the Vault

December 26, 2004: Sumatra-Andaman Islands and Indian Ocean Tsunami More >


Earthquake Spectra: Preprint Manuscripts More >


Support EERI with a Year-End Gift to the Endowment More >

Thank You EERI Donors! More >

Welcome New Members

Welcome New Members More >

Welcome New EERI Student Members!

New EERI Student Members (November 29 - December 14) More >

News of the Profession

Links to Recent News & Views More >


PEER-USGS Workshop: The HayWired Scenario & Building Codes
January 17, 2018
Berkeley, California

Pacific Earthquake Engineering Research Center (PEER) 2018 Annual Meeting
January 18-19, 2018
Berkeley, California

1st International Conference on Infrastructure Resilience
February 14-16, 2018

10th Gulf Seismic Forum for Seismology and Earthquake
Engineering Studies in the Arabian Plate Region
March 19-22, 2018
Muscat, Oman

Geotechnical Earthquake Engineering and Soil Dynamics Conference V
June 10–15, 2018
Austin, TX

16th European Conference on Earthquake Engineering
June 18–21, 2018
Thessaloniki, Greece

11th U.S. National Conference on Earthquake Engineering
June 25–29, 2018
Los Angeles, CA

Deep Foundations Institute (DFI) 43rd Annual Conference
October 24–27, 2018
Anaheim, California

Sixth International Symposium on Life-Cycle Civil Engineering (IALCCE2018)
October 28–31, 2018
Ghent, Belgium

GeoMEast 2018 International
November 24–28, 2018
Cairo, Egypt

EERI 71st Annual Meeting
March 5–8, 2019
Vancouver, B.C., Canada

Social Links

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News of the Institute

Register for the 11NCEE

 11NCEE Registration is Now Open!


 The Eleventh U.S. National Conference on Earthquake Engineering

June 25-29, 2018

The Westin Bonaventure Hotel and Suites

Los Angeles, California


  • 11NCEE Is a milestone event in earthquake engineering that happens only once every four years 
  • 1,200+ professionals attending CSI
  • 800 papers presented
  • 220 posters on display
  • 135 Technical Presentation Sessions
  • A very special reception, generously sponsored by CSI, celebrating the invaluable contributions of Ray Clough and Edward Wilson to the earthquake engineering profession - register early, space is limited!
  • 350 students competing in the 2018 Seismic Design Competition
  • EERI's 70th Annual Meeting
  • Five tours including an all-day tour of the San Andreas Fault, LA Conservancy guided walking tour, LA Department of Water & Power, Ports of Los Angeles and Long Beach, and the Wilshire Grand Center.
  • Five workshops: LFE's Earthquake Reconnaissance Training; New Tools and Guidance for Performance-Based Seismic Design (FEMA P-58 NETAP Training); NHERI Rapid Facility Workshop; Media Interview and Press Conference Techniques and Practice; and Ground Motion Simulations and Engineering Applications.
  • Dynamic keynote speakers include Dr. Lucy Jones, Mayor Eric Garcetti, Ashraf Habibullah, Norm Abrahamson, Tom Birkland, Ellen M. Rathje, and many more to be announced.
  • The foremost experts in earthquake engineering, geology and seismology will be presenting and participating on panels.
  • A broad range of disciplines represented including architecture, civil and structural engineering, seismology, geology, geophysics, geotechnical engineering, business, public policy, social sciences, regional planning, and emergency response management.

Registration grants for graduate students, early career academics, and young professionals to defray costs for attending the Eleventh U.S. National Conference on Earthquake Engineering (11NCEE) are available. View information about selection criteria and apply here.

2017 Shah Family Innovation Prize: Call for Nominations

2016-Shah-HeaderSubmit your nomination for the Shah Family Innovation Prize online by January 31, 2018.

Do you know a young academic or professional making a difference in reducing global earthquake risk? EERI members are encouraged to nominate candidates from government, private firms, academia, and the international community for the 2017 Shah Family Innovation Prize. The Shah Family Innovation Prize was created with a substantial gift to the EERI Endowment Fund by the Haresh C. Shah family of Stanford, California. The intent of the prize is to stimulate further creativity and leadership in the earthquake risk mitigation community and EERI. The selection process recognizes a combination of past accomplishments and future potential, emphasizing creative and innovative thinkers who have demonstrated at early stages in their careers the potential to make major contributions. EERI membership is not required for either the nominator or candidate, although it is strongly encouraged. Candidates must be less than 35 years of age on January 1, 2017.

For more information about the required nomination package, selection criteria, and past winners click here.

EERI extends its appreciation to the Shah Family Innovation Prize Selection Committee: Stacy Bartoletti, Degenkolb Engineers (Chair); Jack Baker, Stanford University; Charles Menun, Consultant; Glenn Rix, Geosyntec Consultants; and Emily So, University of Cambridge.

Have You Renewed Your EERI Membership for 2018?

It's difficult to believe that 2018 is just weeks away - please be sure to renew your EERI membership, if you haven't already done so. On November 20, 2017, all EERI members (except student and honorary members) were sent via email a renewal notice. The personalized email message provided a link to their personal renewal page showing contact information with options for selecting chapter membership and making a voluntary contribution to the EERI Endowment Fund.

Renew Your EERI Membership TodayIf you did not receive this message, please e-mail We hope you will continue to support EERI and renew your membership for 2018.

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Learning from Earthquakes

Now Available: Webinar Recording from Mexico Earthquake Reconnaissance Briefing

Mexico WebinarOn November 14, 2017, EERI hosted the Mexico Earthquake Reconnaissance Briefing Webinar as a part of the Learning from Earthquakes (LFE) program. A recording of the webinar is now available on the Puebla, Mexico Earthquake Virtual Clearinghouse Website: Click here  

The webinar included the following presentations:

  • Introduction by Lucy Arendt, St. Norbert College
  • Earthquake Overview and Response by Luciano Fernandez, UAM AZC
  • Geotechnical Impacts by Tara Hutchinson, UC San Diego/GEER
  • Earthquake Early Warning by Richard Allen, UC Berkeley
  • Structural Impacts by Luciano Fernandez, UAM AZC
  • Lifelines Impacts by Erica Fischer, Oregon State University
  • Reconnaissance Gaps and Needs by Gilberto Mosqueda, UC San Diego

For more information about the September 19, 2017 Mexico Earthquake, visit the Virtual Earthquake Clearinghouse website.

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In Memoriam - Mayor Ed Lee

In Remembrance of San Francisco Mayor Ed Lee

Mayor Ed Lee Mayor Ed Lee On behalf of the Earthquake Engineering Research Institute’s Board of Directors and staff, we wish to express our deep sadness at the passing of San Francisco Mayor Ed Lee. We extend our condolences to his wife Anita, his two daughters, Brianna and Tania, and his family.

Mayor Ed Lee was a civil rights lawyer and housing advocate before joining the staff of the City and County of San Francisco in 1988. As Director of the Department of Public Works, he oversaw the seismic retrofit of City Hall and a number of other civic structures. After Hurricane Katrina, Mayor Lee (then City Administrator) visited Louisiana to witness firsthand the hurricane's impacts on the city’s government and neighborhoods. When he returned he launched the Citywide Resilience and Recovery Initiative to accelerate the citywide departmental planning and preparedness to manage response and recovery from a major earthquake.

He also supported city staff participation in SPUR’s Resilient City initiative and championed the implementation of several of the SPUR recommendations including the launch of the first-ever Lifelines Council to bring all the utility operators in the city together to collaborate on system resilience and restoration planning. He helped to reinvigorate the Citizen’s Action Plan for Seismic Safety (CAPSS) which completed a detailed inventory of the seismic vulnerability of all structures within the City—the oldest building stock west of the Mississippi River, and developed a 30-year Earthquake Safety Implementation Program (ESIP).

Mayor Lee hired an “earthquake czar” to implement ESIP and then elevated that position to be one of the first Chief Resilience Officers in the United States. He also led the passage of several ordinances to implement key elements of CAPSS/ESIP—most notably the mandatory “soft story” retrofit program that requires the upgrade of all large wood-frame apartment buildings in the City that are vulnerable to earthquake shaking and fires, as witnessed in San Francisco’s Marina District in the 1989 earthquake.

While Ed is appropriately being remembered as a great civic leader, a tireless advocate for civil rights, housing and the homeless, and a great husband, father and friend, we at EERI also want to recognize his legacy of seismic safety advocacy and leadership and his commitment to making San Francisco a safer place to live and work will also be remembered. He will be deeply missed.

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Member Spotlight

Resiliency Expert Louise Comfort Named ASCE Natural Hazards Review Co-Editor in Chief

Louis ComfortLouise ComfortThe American Society of Civil Engineers (ASCE) appointed disaster management expert, Louise K. Comfort, Ph.D. (M.EERI,1989), as Co-Editor in Chief of ASCE’s Natural Hazards Review journal. The quarterly publication covers a variety of topics including hazard mitigation, human response and significant issues related to the performance of infrastructure in a natural disaster. Nasim Uddin, Ph.D., P.E., D.WRE, F.ASCE is also Co-Editor in Chief.

Comfort is skilled in decision making under conditions of uncertainty and rapid change and the uses of information technology to develop decision support systems for managers operating under urgent conditions. She advocates a sociotechnical systems approach, emphasizing the interaction between design sciences and organizational studies to create infrastructure that is resilient in a changing world. She has studied this approach in her field study work for 23 earthquakes, including Haiti, Japan and Indonesia. Comfort plans to bring a sociotechnical approach with a focus on resiliency to the journal.

“Looking forward, I would like to outline a new category of sociotechnical issues for publication in the journal, as the world is much more complex, interrelated and interconnected than any single discipline can manage,” says Comfort. “As a whole, the Natural Hazards Review should assist professionals and the public with understanding the risk of hazards in the area in which they live and give a sense of how a sociotechnical approach can help reshape infrastructure resilience for future disasters.”

Comfort holds a B.A. in political science and philosophy from Macalester College, a M.A. in political science from University of California, Berkeley, and a Ph.D. in Political Science from Yale University. Formerly the Director of the University of Pittsburgh’s Center for Disaster Management, Comfort is currently a professor at the university’s Graduate School of Public and International Affairs.

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DFI's 43rd Annual Conference: Deadline for Abstracts has been Extended to December 22, 2017

DFIThe Deep Foundations Institute's (DFI) 43rd Annual Conference, Mastering the Challenge: Engineering for Complex Loading Conditions in the 21st Century, has extended its Call for Abstracts deadline to Friday, December 22, 2017.

The conference will be held October 24-27, 2018 in Anaheim, California and will feature technical presentations on innovations and advancements that address performance based design and construction of foundations subject to increasingly challenging structural demands.

To learn more about the DFI Conference and submit an abstract, click here.

Nominations for the Nigel Priestley International Prize 2018 are Now Open

NPIP2018The Eucentre Foundation has the pleasure to announce the 2018 edition of the Nigel Priestley International Prize (formerly known as ROSE Prize).

Since 2008 the Prize, attributed with a frequency of two years, rewards professionals and academics at any stage of their careers who have demonstrated uncommon skills in education or exceptional creativity and innovation capacity in the fields of earthquake engineering and engineering seismology, and have achieved extraordinary research and professional achievements.

Individuals in government, private firms, academia, and the international community are encouraged to nominate eligible candidates no later than January 31, 2018 to prize.nomination@eucentre.

For more information about the Prize and nomination process, please click here.

2018 Fazlur R. Khan Distinguished Lecture Series

LehighDates and speakers have been announced for the 2018 Fazlur R. Khan Distinguished Lecture Series to be held at Lehigh University, Bethlehem, PA:

February 23: Surendra P. Shah: "Sustainability in Concrete Construction Based on Nanotechnology"
March 23: Robert Sinn:"From Bilbao to Jeddah: An Engineer’s Journey"
April 13: Yozo Fujino: "Lessons Learned from 30 Years of Experience in Dynamics, Monitoring and Control of Bridges"

For additional information please visit:

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EERI Resources from the Vault

December 26, 2004: Sumatra-Andaman Islands and Indian Ocean Tsunami

Tsunami 2004Thirteen years ago, at 7:58 A.M. local time on Sunday, December 26, 2004, a M9.0 earthquake occurred in the Indian Ocean Approximately 250 km west of Sumatra, Indonesia. This was the second largest instrumentally recorded earthquake in history. The earthquake had an average source duration of 500 seconds, the longest ever recorded, and a rupture length of about 1,300km, the largest ever determined instrumentally. The earthquake generated one of the most devastating tsunamis in recorded history.

Photo: Densely built structures three rows deep adjacent to the shoreline in Kalmunai were leveled, but damage to structures inland decreased progressively with distance.

Photo credit: Adam Ludwig

Member Resources: More resources are available in the LFE Reconnaissance Archive where EERI members can read reports and Earthquake Spectra articles, view photos, and peruse other findings. Members can also access EERI's Earthquake Photo Galleries through the Member Resources site and non-members can preview the galleries here.

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Earthquake Spectra: Preprint Manuscripts

spectra 150Sixteen (16) preprint manuscripts have been posted to the Earthquake Spectra website prior to formal publication. The papers to be published are:   

  • Seismic Vulnerability Assessment of Two Nepalese Rana Palaces by Hima Shrestha, Dmytro Dizhur (M.EERI,2014), Rajani Prajapati, Marta Giaretton (M.EERI,2015), Ivan Giongo, Ramesh Guragain, Paul Jacquin, Jitendra Bothara and Jason Ingham (M.EERI,2012)
  • Strong-Motion Characteristics and Visual Damage Assessment Around Seismic Stations in Kathmandu after the 2015 Gorkha, Nepal, Earthquake by Subeg Bijukchhen, Nobuo Takai (M.EERI,1998), Michiko Shigefuji, Masayoshi Ichiyanagi and Tsutomu Sasatani
  • Performance of Medium-to-High Rise Reinforced Concrete Frame Buildings with Masonry Infill in the 2015 Gorkha, Nepal, Earthquake by Andre R. Barbosa, Larry A. Fahnestock (M.EERI,2001), Damon R. Fick (M.EERI,1998), Dipendra Gautam (M.EERI,2016), Rajendra Soti (M.EERI,2017), Richard Wood (M.EERI,2011), Babak Moaveni, Andreas Stavridis (M.EERI,2004) and Michael J. Olsen (M.EERI,2004)
  • Building Damage Assessment in the 2015 Gorkha, Nepal, Earthquake Using Only Post-Event Dual Polarization Synthetic Aperture Radar Imagery by Bai Yanbing (M.EERI,2017), Bruno Adriano, Erick Mas and Shunichi Koshimura
  • Performance of Hydropower Infrastructure after the 2015 Gorkha Earthquake Sequence by Menzer Pehlivan (M.EERI,2009), Christopher Madden Madugo, Amy Macdonald, Deepak Rayamajhi (M.EERI,2013), Youssef M.A. Hashash (M.EERI,1999) and Binod Tiwari
  • Comparison of the Reinforced Concrete Seismic Provisions of the Design Codes of the United States, Colombia and Ecuador for Low-Rise Frames by Orlando Arroyoa, José Barros (M.EERI,2016), and Lilibeth Ramos Castillo (M.EERI,2017)
  • Performance Prediction Equations for Linear Planar Structural Systems: Concept, Formulation, and Validation by Marta De Bortoli (M.EERI,2014) and Farzin Zareian (M.EERI,2005)
  • Characterizing Dynamic Decay of Motion of Freestanding Rocking Members by Dimitrios Kalliontzis (M.EERI,2017) and Sri Sritharan (M.EERI,1994)
  • Damage Index for Different Structural Systems Subjected to Recorded Earthquake Ground Motions by Mario E. Rodriguez (M.EERI,1985)
  • Consequences of Modeling Choices in Seismic Performance Assessment of Buildings by Daniel J. Swensen and Sashi K. Kunnath (M.EERI,1990)
  • Increasing Student Understanding of Response Spectra: An Argument for the Inductive Learning Approach by H. Benjamin Mason (M.EERI,2008), David S. Hurwitz, Rachel K. Adams, Kamilah Buker, Richard K. Slocum, and Michael H. Scott
  • Aftershock Hazard Assessment Based on Utilization of Observed Main Shock Demand by Ziya Muderrisoglu (M.EERI,2017) and Ufuk Yazgan (M.EERI,2017)
  • Apparent Wave Velocity and Site Amplification at the CSMIP Carquinez Bridge Geotechnical Arrays during the 2014 M6.0 South Napa Earthquake by Tadahiro Kishida (M.EERI,2005), Hamid Haddadi (M.EERI,2002), Robert B. Darragh (M.EERI,1985), Robert E. Kayen (M.EERI,2004), Walter J. Silva (M.EERI,1988), and Yousef Bozorgnia (M.EERI,1986)
  • Multivariate Conversion of Moment Magnitude for Small-to-Moderate Magnitude Earthquakes in Iran by Tadahiro Kishida (M.EERI,2005), Sahar Derakhshan (M.EERI,2012), Sifat Muin (M.EERI,2014), Robert B. Darragh (M.EERI,1985), Yousef Bozorgnia (M.EERI,1986), Nicolas Kuehn, and Dong Youp Kwak (M.EERI,2014)
  • A Framework for Post-Earthquake Response Planning in Emerging Seismic Regions: An Oklahoma Case Study by P. S. Harvey Jr. (M.EERI,2015), S. K. Heinrich, and K. K. Muraleethara 
  • Consideration and Propagation of Ground Motion Selection Epistemic Uncertainties to Seismic Performance Metrics by 

    Karim Tarbali (M.EERI,2017), Brendon A. Bradley (M.EERI,2012), and Jack W. Baker (M.EERI,2004)

To read all current preprint manuscripts posted, visit Earthquake Spectra preprints.

If you have questions about Spectra, contact Managing Editor Liz Stalnaker at

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Support EERI with a Year-End Gift to the Endowment

eeri logo webEERI invites you to consider making a donation to the EERI Endowment Fund before this year comes to a close. The generosity of EERI members has allowed the Institute to create many valuable programs since the Endowment’s inception in 1994. Your gift will enable EERI to build on this substantial foundation by supporting innovative projects, independent of government funding, which will advance the field of earthquake engineering as well as benefit you, our members.

You may choose to donate to one of EERI’s many important programs, Learning from Earthquakes or the World Housing Encyclopedia for example, or to the general endowment to support exciting new initiatives in the New Year.

donateTo donate online, visit and click the red Donate button at the top right. You can also choose to make a donation on the renewal form when you renew your membership for 2018.

Did you know that under the Pension Protection Act of 2006, members aged 70.5 years and older may make donations from IRAs without claiming the distributions as income? Please consider discussing this opportunity to support the EERI Endowment with your tax advisor. E-mail for more information.

EERI appreciates your support!

Thank You EERI Donors!

EERI would like to thank donors to the Endowment Fund and special programs, and gratefully acknowledges these recent contributions.

The list below reflects recent donations to the Institute.

Boston Private

The Bechtel Corporation

John Coil

$100 - $250

Barry Welliver
Sandra Hyde
Ian Aiken
Peter May
Mehri Ansari
Joe Hollstein

Other Amounts

Sohrab Esfandiari
Mehri Ansari
Joe Hollstein
Satwant Rihal
Alfredo Urich

Thank you for your generous support!

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Welcome New Members

Welcome New Members

EERI welcomes members who have recently joined the Institute (Nov. 28-Dec 14, 2017). If you wish to connect with your fellow members, you can locate their contact information in the EERI online membership directory, which requires logging in to the Member Resources Area of the EERI website. 


Jared Carlson, Trimble Navigation Ltd
Konstantinos Trevlopoulos, Civil


Chi-Chang Lin, National Chung Hsing University, Structural


Ammar Iskendar, Universiti Teknologi Malaysia
Adilla Syafiqah, Universiti Teknologi Malaysia
Muhammad Faris Mohd Azmi, Universiti Teknologi Malaysia
Hui Jin Teow, Universiti Teknologi Malaysia,
Balqis Yuhanis Yusoff, Universiti Teknologi Malaysia
Ahmad Zubir Zainal, Universiti Teknologi Malaysia


Nanjing University of Technology


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Welcome New EERI Student Members!

New EERI Student Members (November 29 - December 14)

Bryan Acevedo, University of Puerto Rico–Mayaguez
Zachary Barnett, Brigham Young University, Structural
Jeff Bayless, UC Davis, Civil
David Bell, Brigham Young University, Civil
Bryce Berrett, Brigham Young University, Geotechnical
David Blake, Brigham Young University, Civil
Yuan Calderon, University of Puerto Rico-Mayaguez, Civil
Victor Calderón Astuhuamán, Pontificia Universidad Católica del Perú, Structural
Bryant Carranza, University of Kansas, Civil
Bridget Crowley, Purdue University, Civil
Seval Ertekin, Sakarya Üniversity, Social Science
Hermanpreet Gill, University of British Columbia, Geotechnical
Gülşah Güneş, Sakarya Üniversity, Architect
Adeyoyin Imam, University of Kansas, Civil
Kourosh Irani, California State University,Long Beach, Civil
Tamarah King, University of Melbourne, Geologist
Justin Kula, Virginia Tech, Civil
Xinyu Lin, Dalian University of Technology, Civil
Cameron Lusvardi, Brigham Young University, Geotechnical
Christian Marrero, University of Puerto Rico-Mayaguez, Civil
Tyler Mickelson, Brigham Young University, Geotechnical
Annie Nguyen, California State University,Long Beach, Civil
Gustavo Orozco, San Carlos University, Structural
Michael Quiñones, University of Puerto Rico–Mayaguez
Michael Reynolds, Brigham Young University, Civil
Clarissa Teng, University of California Irvine, Civil
Valerie Velez, University of Puerto Rico–Mayaguez
Yanxin Yang, Arizona State University, Geotechnical
Nina Zabihi,University of Michigan, Geotechnical

EERI Student Members: Be sure to login to EERI Members Only Resources to explore earthquake photo galleries, publications, reports, and much more. To update your member information and reach out to other EERI members, login to the EERI Member Directory by using your email address as your username and your EERI ID number for your password. Please note that if you did not include the name of your college/univesity when you joined EERI, your membership is not active until we receive that information.

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News of the Profession

Links to Recent News & Views

Seven (7) recent articles, stories, opinions, or reports from around the web.

1oneResilient Cities: What Would an Earthquake-Proof City Look Like? (The Guardian) Earthquakes don’t kill people (generally), collapsing buildings do – meaning it is cities where the most lives can be saved. Here are the smartest ideas from Japan, New Zealand, Colombia, Ecuador, and others. Read more

2twoMexico City Provides Valuable Lessons for U.S. Earthquake Early Warning System (Berkeley News) To determine how the public reacted to the early warning notices after the Sept. 7 Chiapas quake and the Sept. 19 Puebla quake, a team of seismologists from UC Berkeley, the USGS, and EERI flew to Mexico City in September. Read more

3threeQuake Warnings, Seismic Culture (Science) Related to the article above, an editorial detailing the Mexico City Earthquake Reconnaissance Team's findings and recommendations. Read more

4fourQuake-Damaged SH1 North of Kaikoura to Finally Reopen After 'Unprecedented' 13 Month Repair Job (New Zealand Herald) State Highway One, north of Kaikoura, which was wiped out by last year's massive earthquake, will finally reopen after 13 months of "unprecedented" repair work. Read more

5fiveScientists to Map Areas at Risk from Liquefaction (EurekAlert!) The LIQUEFACT project, which has received €4.9 million in funding, is led by academics at Anglia Ruskin University and involves partners from universities in European countries particularly susceptible to earthquakes. Read more

6sixIncreased Seismic Activity in Oregon Highlighted by Tremor and a M=4.0 Quake (Temblor) On Dec. 14th a M=4.0 quake just south of Portland registered over 4,000 felt reports on the USGS website. Though it did not cause any damage, it occurred in almost the exact same spot as a M=5.6 in 1993. Read more

7sevenDelaware Earthquake a Head-Scratcher for Seismologists; No Known Fault Line Where Tremor Occurred ( A rare 4.1 magnitude earthquake rattled Delaware on Nov 30. Felt by residents in multiple cities along the East Coast; there's no known fault line where the tremor occurred. Read more

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