Distribution of local earthquakes in the crust beneath central Lake Baikal

We have located earthquake hypocenters in the area of central Lake Baikal using the Hypoellipse inversion of direct P traveltimes collected by a local seismological network of seven stations in 2001 through 2005. The location accuracy depends on the agreement between the reference velocity model and...

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Bibliographic Details
Published inRussian geology and geophysics Vol. 49; no. 8; pp. 611 - 620
Main Authors Suvorov, V.D., Tubanov, Ts.A.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2008
Allerton Press
Subjects
Asia
Baikal region
Baikal rift
Baikal rift zone
body waves
Buryat Russian Federation
Commonwealth of Independent States
crust
deep seismic sounding
depth
earthquakes
elastic waves
epicenters
focus
hypocenter location
Irkutsk Russian Federation
Lake Baikal
P-waves
Russian Federation
seismic waves
Seismology
Selenga River basin
spatial distribution
traveltime
Baikal rift
hypocenter location
crust
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Summary:We have located earthquake hypocenters in the area of central Lake Baikal using the Hypoellipse inversion of direct P traveltimes collected by a local seismological network of seven stations in 2001 through 2005. The location accuracy depends on the agreement between the reference velocity model and the real subsurface. Traveltime residuals have no bearing on the accuracy of depth estimates due to origin time errors. Hypocenter location with reference to a DSS-derived layered velocity model predicts that the crust is seismogenic between 10 and 22 km. The hypocenters cluster densely in belts trending in NE and SE directions along and across Lake Baikal. Earthquakes become deeper from 10 to 22 km toward the Selenga basin.
ISSN:1068-7971
1878-030X
DOI:10.1016/j.rgg.2007.09.019