Vol.45 January 2011 Yuji YAGI
MOMENT TENSOR INVERSION OF NEAR SOURCE SEISMOGRAMS
Authors: Yuji YAGI, Naoki NISHIMURA
Abstract fulltext
We constructed a program set for estimating moment tensor solutions using near source seismograms. We take the effect of the source time function into account, which has been neglected in predominant program sets of the moment tensor analysis with near source seismograms. In our program set, we approximate the horizontal location of the centroid to be epicenter, and then estimate a seismic source duration and depth of centroid in the moment tensor inversion procedure. To evaluate our program set, we applied it to three earthquakes: an aftershock (MJMA 6.4) of the 2003 Tokachi-oki great earthquake, the 2004 Nemuro-oki earthquake (MJMA 7.1) and its aftershock (MJMA 4.2). The results show that the obtained moment tensor solutions for large earthquakes are consistent with those in other studies. We also found that the neglect of the source time duration will result in an underestimation of the seismic moment.
Citation: Yuji YAGI, Naoki NISHIMURA (2011). MOMENT TENSOR INVERSION OF NEAR SOURCE SEISMOGRAMS. Bulletion of IISEE, 45, 133-138.
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