Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.143..407c&link_type=abstract
Geophysical Journal International, Volume 143, Issue 2, pp. 407-416.
Astronomy and Astrophysics
Astronomy
5
Earthquake Source Mechanism, Fault Slip, Inversion, Rupture Process, Source Time Function, Tibetan Plateau
Scientific paper
A time-domain inversion technique is proposed to invert for the tempo-spatial distribution of slip on an earthquake fault plane. This technique is based on the idea that a finite fault plane can be divided into several subfaults, each of which can be treated as a point source, and that the source time function (STF) of the finite fault is the weighted sum of the STFs of all the subfaults. This technique is applied to deduce the source processes of three recent large earthquakes in the Qinghai-Xizang (Tibetan) Plateau. The 1990 April 26 Gonghe, Qinghai, earthquake, MS6.9, ruptured on a fault plane with a strike of 113°, a dip of 68° and a rake of 89°. The fault has a length of 45km, a width of 15km and a total moment release of 9.4×1018Nm. The rupture initiated at the WNW end of the fault and propagated unilaterally towards the ESE end of the fault. In total, the rupturing lasted for 45s and was divided into two episodes (the first 9s long and the second 16s long with 20s quiescence in between). There are two distinct rupture regions (nuclei) on the fault plane. These two nuclei, with maximum slips of about 62 and 55cm, are about 25km apart in the WNW-ESE direction. The 1996 February 3 Lijiang, Yunnan, earthquake, MS7.0, has a focal mechanism with a strike of 157°, a dip of 48° and a rake of -102°. The earthquake fault is about 45km with a width of 20km and a total moment release of 9.8×1018Nm. The total duration of the rupture was 16s, is divided into two episodes (the first 8.5s long and the second 7.5s long). The inverted final slip distribution of the Lijiang earthquake also shows two nuclei. One nucleus, with a maximum slip of 40cm, is located on the NNW portion of the fault at a shallower depth and the other, with a maximum slip of 50cm, is located on the SSE portion of the fault at a greater depth. The 1997 November 8Mani, Xizang (Tibet), earthquake, MS7.9, has a focal mechanism with a strike of 250°, a dip of 88° and a rake of 19° and a moment release of 3.4×1020Nm. The total duration of the rupture was about 15s. The inverted final slip distribution of the Mani earthquake shows three nuclei on the fault plane. The first nucleus, with a maximum slip of 956cm, is located at the WSW end of the fault at 10km in depth. The second, with a maximum slip of 743cm, is located at the ENE end of the fault, 55km away from the WSW end of the fault and at 35km depth. The third, with a maximum slip of 1060cm, is about 30km away from the WSW end of the fault and at about 40km depth. These three nuclei form a total rupture area of about 70km in length and 60km in depth.
Chen Yu-Tung
Xu Li-Sha
No associations
LandOfFree
A time-domain inversion technique for the tempo-spatial distribution of slip on a finite fault plane with applications to recent large earthquakes in the Tibetan Plateau does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A time-domain inversion technique for the tempo-spatial distribution of slip on a finite fault plane with applications to recent large earthquakes in the Tibetan Plateau, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A time-domain inversion technique for the tempo-spatial distribution of slip on a finite fault plane with applications to recent large earthquakes in the Tibetan Plateau will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1610920