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2003 September 27 11:33:25 UTC

Preliminary Earthquake Report

Small Globe

Magnitude 7.3
Date-Time Saturday, September 27, 2003 at 11:33:25 (UTC)
= Coordinated Universal Time
Saturday, September 27, 2003 at 6:33:25 PM
= local time at epicenter

Time of Earthquake in other Time Zones
Location 49.954°N, 87.832°E
Depth 18 km (11 miles) set by location program
35 km (20 miles) WSW of Chaganuzun, Russia
240 km (150 miles) N of Altay, Xinjiang, China
300 km (185 miles) W of Ulaangom, Mongolia
3360 km (2090 miles) E of MOSCOW, Russia
Location Uncertainty horizontal +/- 4.5 km (2.8 miles); depth fixed by location program
Parameters Nst=352, Nph=380, Dmin=243.5 km, Rmss=1.13 sec, Gp= 25°,
M-type=teleseismic moment magnitude (Mw), Version=U
Comments Unconfirmed reports of 3 people who died from heart attacks, more than 5 injured, 1,800 homeless, 300 houses destroyed (X); 1,942 buildings damaged, infrastructure damaged and landslides occurred in the Kosh-Agach and Ust-Ulagan area. Significant damage also reported at Ongudai and Shebalino. Damage estimated at 10.6 million U.S. dollars. Ground subsidence occurred in the Chaganuzun area which created a flood of the Chuya River. Felt (VI) at Prokop'yevsk and Tashtagol; (V) at Novosibirsk; (IV) at Abakan; (III) at Barnaul, Kemerovo, Krasnoyarsk and Zaysan. Felt throughout southern Siberia. Also felt (IV) at Ust'-Kamenogorsk and Semipalatinsk; (III) at Alma-ata, Astana, and Taldyqorghan, Kazakhstan.
Event ID uszfak

Tectonic Summary
This earthquake resulted from stresses originating with the collision of the Indian plate against the Eurasian plate. The collision of the two major plates has generated the Himalayan mountains, far to the south of the epicenter of this earthquake, and produces deformation of the earth's crust over a broad region of central and eastern Asia. In the epicentral region of southern Russia, north-western China, eastern Kazakhstan, and western Mongolia, earthquakes of past decades have been caused by strike-slip faulting (as with this earthquake) and reverse faulting.

This earthquake is the largest in this region since an earthquake on December 20, 1761 that is thought to have had a magnitude of about 7.7.

Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver