2003 Altai earthquake

Earthquake in Altai Republic, Russia 2003 Altai earthquake 2003-09-27 11:33:25 usp000c8sz 7136530 Russia Altai Republic#Russia 2003 09 27 18:33 7.3 Mw 12.3 km mi 0 on 49.99 87.79 region:RU_type:event inline,title Oblique-slip $10.6–33 million X Yes 3 dead, 5 injured The 2003 Altai earthquake, or 2003 Chuya earthquake, occurred on September 27 at 18:33:26 local time 11:33:26 UTC with a moment magnitude of 7.3 and a maximum intensity of shaking of X (Extreme) on the Modified Mercalli intensity scale. The epicenter of this oblique-slip shock was in Altai Republic, Russia near the borders of Mongolia, China and Kazakhstan. Three deaths and five injuries were reported and the total damage was listed as $10.6–33 million. Tectonic setting The Altai Mountains form the most northerly part of the complex zone of collision between the Indian and Eurasian plates, contributing 7 mm per year of the total 35 mm per year of convergence between the two plates, according to estimates from GPS data. The main structures accommodating this convergence are northwest–southeast trending right lateral strike-slip faults with subordinate west–east trending thrust faults, associated with the ends of the strike-slip structures. Most previous seismicity in the area in the instrumental era are dextral strike-slip in type. Only one thrust fault event (w 5.2) has been observed trending parallel to the Altai chain in this period. Earthquake The total length of the fault rupture was about 60 km, based on observations of surface rupture, although the extent of aftershocks suggest that the rupture at depth was somewhat longer.Dorbath C. Van der Woerd J. Arefiev S.S. Rogozhin E.A. Aptekman J.Y. 2008 Geological and Seismological Field Observations in the Epicentral Region of the 27 September 2003 Mw 7.2 Gorny Altay Earthquake (Russia) Bulletin of the Seismological Society of America 98 6 2849–2865 10.1785/0120080166 This earthquake had components of right-lateral strike-slip and reverse movement in a segmented fault zone which had not been previously recognized. Based on field observations and the analysis of InSAR data, the fault responsible for the earthquake dips steeply to the northeast.Combining InSAR and seismology to study the 2003 Siberian Altai earthquakes—dextral strike-slip and anticlockwise rotations in the northern India–Eurasia collision zone E. Nissen B. Emmerson G. J. Funning A. Mistrukov B. Parsons D. P. Robinson E. Rogozhin T. J. Wright 2007 Geophysical Journal International Wiley 10.1111/j.1365-246X.2006.03286.x 169 1 216–232 free 2007GeoJI.169..216N Further analysis of the three–dimensional distribution of aftershocks, however, suggest that the fault zone is sub-vertical, extending down to a depth of 17 km. Modelling of the observed InSAR fringe pattern is consistent with at least three fault segments moving during the earthquake. The two segments to the northwest moved with dominantly right-lateral strike-slip, with a component of reverse movement. The most southeasterly segment had a pure reverse slip displacement. Damage Between 99 and 300 houses were destroyed, along with 1,942 other buildings affected. It was the strongest earthquake in this region since an estimated magnitude 7.7 earthquake on 20 December 1761.M7.3 Respublika Altay, Russian Federation Earthquake of 27 September 2003 https://earthquake.usgs.gov/archive/product/poster/20030927/us/1457985013469/poster.pdf United States Geological Survey Ground effects Landslides affected the Kosh-Agachsky and Ust'-Ulagan Districts. See also List of earthquakes in 2003 List of earthquakes in Russia References ISC-GEM Global Instrumental Earthquake Catalogue (1900–2012) http://www.isc.ac.uk/iscgem/index.php ISC 2016 International Seismological Centre Version 3.0 Significant Earthquake Database https://www.ngdc.noaa.gov/hazel/view/hazards/earthquake/search National Geophysical Data Center / World Data Service (NGDC/WDS) National Geophysical Data Center, NOAA 10.7289/V5TD9V7K 1972 Data Set PAGER-CAT Earthquake Catalog https://earthquake.usgs.gov/static/lfs/data/pager/catalogs/ https://web.archive.org/web/20200313112456/ftp://hazards.cr.usgs.gov/web/data/pager/catalogs/ dead 2020-03-13 September 4, 2009 United States Geological Survey Version 2008_06.1 External links 7136530 Category:2003 earthquakes Altai Earthquake, 2003 Category:Earthquakes in Russia Category:Natural disasters in Siberia Category:September 2003 in Russia +Rus Category:History of the Altai Republic Category:2000s in Siberia