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Author Kang, Tae Seob ♦ Baag, Chang Eob
Source SpringerLink
Content type Text
Publisher Springer-Verlag
File Format PDF
Copyright Year ©2004
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Earth sciences ♦ Geology, hydrology & meteorology
Subject Keyword the 29 May 2004 offshore Uljin earthquake ♦ earthquake sequence ♦ dynamic stress triggering ♦ thrust fault ♦ the Ulleung Fault ♦ Geosciences
Abstract We present results of a preliminary analysis for source parameters of the 29 May 2004 offshore Uljin earthquake. The analysis is based on a set of broadband and short period velocity seismograms, and accelerograms recorded by seismic networks in southern Korea. The estimated parameters of the mainshock are as follows: origin time 19∶14∶25.82 in Korean local time (10∶14∶25.82 UT), latitude 36.626°N, longitude 130.054°E, depth 18 km, magnitudeM $_{ w }$ 5.1, stress drop 28 bars, one focal plane 337°, 56° and 78°, and the other plane 178°, 36° and 107° in strike, dip and rake, respectively. Three aftershocks ofM $_{ w }$ 2.3, 2.0 and 2.4 occurred within source region of the mainshock, and two other events ofM $_{ w }$ 2.5 and 3.5 at epicenters beyond the rupture area are presumed to be triggered dynamically by the 29 May 2004 earthquake. The largest ground acceleration, 2.62%g, was instrumentally recorded at Pohang, 90.4 km south-west of the mainshock epicenter. The maximum instrumental intensity is estimated as V and VI in Modified Mercalli Intensity scale excluding and including local effects, respectively. There is a possibility that the mainshock-aftershock sequence and one of the dynamically triggered events are directly related to the Ulleung Fault.
ISSN 12264806
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2004-01-01
Publisher Place Berlin, Heidelberg
e-ISSN 15987477
Journal Geosciences Journal
Volume Number 8
Issue Number 2
Page Count 9
Starting Page 115
Ending Page 123


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Source: SpringerLink