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Archives for 2008

Yellowstone Swarm (Wyoming)

December 26, 2008 – January 8, 2009 Series; Largest: M3.9 Earthquake

Available Information


GENERAL INFORMATION

Beginning on December 26, 2008, a swarm of over 900 earthquakes occurred within the very large (34 miles wide by 45 miles long) Yellowstone Caldera. The largest occurred in a remotely populated area of the park (which is closed for the winter), with a magnitude of 3.9. A second smaller earthquake swarm began on January 9, 2009, with a maximum magnitude of 3.2. The map indicates the first swarm started in Yellowstone Lake and migrated towards the north shore. Earthquake swarms occur nearly every year at Yellowstone Park, although the last time a swarm was this energetic was in 1985.

Increased seismic activity in the Yellowstone area is of great concern because some of the largest volcanic eruptions on Earth have come out of the Yellowstone Caldera. The most recent was about 640,000 years ago and spewed ash over much of what is now the United States. There have been a number of volcanic eruptions since then with large lava flows.

The Yellowstone hotspot is an area where basaltic magma rises from the mantle into the Earth’s crust. Partially molten rock exists at least four miles beneath the surface, releasing heat that fuels the geysers and other thermal features in the park. Earthquakes in the area occur due to normal faulting (such as the devastating 1959 Hebgen earthquake), the movement of magma, and hydrothermal fluid activity.

The Yellowstone Volcano Observatory (YVO) was created in part to provide warnings of potential volcanic activity at Yellowstone. So far, no other geological activity has been observed accompanying this earthquake swarm. Notices from the YVO are available at: volcanoes.usgs.gov/yvo/ .

Baluchistan Province

October 28, 2008, M6.4 Earthquake

Available Information

EERI REPORTS

Chino Hills, California

July 29, 2008, M5.4 Earthquake

Available Information

EERI REPORTS

Eastern Honshu

June 13, 2008, M6.9 Earthquake

Available Information


EERI REPORTS


OTHER REPORTS

Offshore Greece

June 8, 2008, M6.3 Earthquake

Available Information


EERI REPORTS

  • Newsletter Articles

  • Reconnaissance Team Reports

    • Preliminary Report by EERI member Dr. E. Lekkas and colleagues I.Fountoulis, G.Danamos, L.Gouliotis, S.Mavroulis, I.Kostaki of the University of Athens [PDF]


OTHER REPORTS

  • GEER Preliminary Report prepared by colleagues at Institute of Engineering Seismology and Earthquake Engineering in Thessaloniki, the University of Patras, and UCLA [PDF]
  • Preliminary Report by Apostolos S. Papageorgiou, Department of Civil Engineering, University of Patras, Greece [PDF]

PHOTOS

Wenchuan

May 12, 2008, M7.9 Earthquake

Available Information


EERI REPORTS


OTHER REPORTS


PHOTO GALLERY

  • Photo Gallery (265 photos) from Veronica Cedillos, project manager with Geohazards International, who visited Chengdu, Dujiangyan, Bailu, Pengzhou, Mianzhu, and Hanwang in July


VIDEOS


LINKS

Earthquake swarm in Reno, Nevada

April 25, 2008, Magnitude 4.7 Earthquake

Available Information

EERI REPORTS

Market Rasen

February 27, 2008, M4.7 Earthquake

Available Information

EERI REPORTS

Nevada

February 21, 2008, M6.0 Earthquake

Available Information


EERI REPORTS


LINKS


PHOTO GALLERY

Simeulue Island

February 20, 2008, M7.4 Earthquake

Available Information

EERI REPORTS