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Padang, Indonesia

September 30, 2009, M7.6 Earthquake

Available Information

 

EERI has organized a reconnaissance team with participation from U.S. and Indonesian colleagues. Professor Greg Deierlein from Stanford is leading the team.  The team has uploaded  many photos and reports from the field to a special Virtual Clearance blog website.  Read the blog HERE.


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OTHER REPORTS


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PHOTO GALLERY


VIDEOS

Samoan Islands

September 29, 2009, M8.0 Earthquake

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REPORTS


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PHOTO GALLERY

Carabobo, Venezuela (offshore)

September 12, 2009, M6.2 Earthquake

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EERI REPORTS

OTHER REPORTS


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Java, Indonesia

September 2, 2009, M7.0 Earthquake

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EERI REPORTS

Gulf of California Earthquakes

August 3, 2009, M6.9 Earthquake

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EERI REPORTS

Fiordland, New Zealand

July 16, 2009, M7.8 Earthquake

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EERI REPORTS


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Yunnan

July 9, 2009, M6.0 Earthquake

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EERI REPORTS


OVERVIEW

Junwu Dai of the Institute of Engineering Mechanics in the China Earthquake Administration provided the following information:

An Ms6.0 earthquake struck Guantun of Yaoan County in the Yunnan Province of China at 19:19 p.m. July 9, 2009.The epicenter was located at latitude N25°36’, longitude E101°06’, with maximum damage intensity VIII. One person was killed and 31 severely wounded. The earthquake caused about 2.15 billion Chinese yuan in direct economic losses, including damage to local buildings and lifeline systems as well as other structures in seven counties (Yaoan, Dayao, Nanhua, Mouding, Yongren, Xiangyun and Binchuan). The total damaged area is about 6,958 square km, with 230 square km of inten- sity VIII, 883 square km of intensity VII, and 5,845 square km of intensity VI.

 

The details of the strongest ground motion recorded by The Yunnan Digital Strong Motion Net in the earthquake are listed below.

Event Station Distance
(km)
PGA/gal
 EW  NS  UD

 

Ms 6.0 Hedian,Xiangyun 31.3
28.5 80.8 70.8

 

 Details of the strongest ground motion recorded in Yaoan EQ

 

Based on the field investigation to 150 residential communities, the intensity contour is determined in fig.1.  The total damaged area is about 6958 square Km with 230 square Km of intensity Ⅷ area, 883 square Km of intensity VII area and 5845 square Km of intensity VI area

Damage Characteristics

    1. Damage to buildings:

 

    1. In the damage intensity VIII area, adobe/wood structures are the principal building type. Severe damage or collapse occurred to 42% of them, 48% were lightly damaged, and 10% undamaged. A small quantity of brick buildings collapsed; most were lightly damaged or undamaged. In the intensity VII area, few adobe/wood and brick/wood buildings collapsed or were seriously damaged. In the intensity VI area, most buildings remained intact except for a few seriously damaged very old adobe or brick houses.

 

    1. Damage to infrastructure:

 

  1. Impacts to transportation systems included roadbed collapse, road subsidence, road surface cracks, slope collapse, culvert cracks, and bridge damage. Impacts to the power supply system included transmission pole collapse, lines broken, and damage to transformers and meters. Damage occurred to network and telecommunication facilities and broadcasting facilities. The water supply and wastewater systems sustained cracked pipelines, and reaction tank walls and joint leakage. Impacts to the hydraulic system included individual dam deformation, dam shoulder and foot leakage, anchor gate deformation, culvert leakage, irrigation canal cracks, and operation panel damage.

Honduras (offshore)

May 28, 2009, M7.3 Earthquake

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EERI REPORTS


OTHER REPORTS

L’Aquila, Italy

April 6, 2009, M6.3 Earthquake

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  • GEER Report: Preliminary Report on the Seismological and Geotechnical Aspects of the April 6 2009 L’Aquila Earthquake in Central Italy
  • Quick Response Report from the Natural Hazards Center: Vulnerability of Reinforced Concrete Frame Buildings and Their Occupants in the 2009 L’Aquila, Italy Earthquake by Liel and Lynch


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Southern California Swarm

March 21, 2009, M4.8 Earthquake

Available Information



GENERAL INFORMATION

On Saturday, March 21, 2009, an earthquake swarm began near Bombay Beach, near the southern end of the San Andreas fault on the eastern side of the Salton Sea in southern California. Within the first week of the swarm, over 350 earthquakes were recorded, the largest of which was a magnitude 4.8 event that occurred on March 24 at 4:55 AM PST. It was felt by over 400 people within the San Diego region. The M4.8 moment tensor solution displays strike-slip motion, with the preferred nodal plane strike of N57E. This solution is consistent with a fault or faults orthogonal to the San Andreas fault, located in the northern Brawley Seismic Zone.

The NNW-trending Brawley Seismic Zone overlies an inferred short spreading center segment between the San Andreas and Imperial (transform) faults in the southern Salton Trough. Precisely relocated seismicity in this zone indicates that it consists of a series of left-stepping, left-lateral faults. From 1932 to 2008, 722 events were recorded within a 5-km radius of this current swarm. Prior to this sequence, the largest event recorded in this region was M4.2 on 11/13/99, which was triggered by the Hector Mine earthquake on 10/16/1999. For more information, visit www.scsn.org/2009bombaybeach.html.

EERI REPORTS