利用1-Hz GPS波形数据反演2011年日本东北大地震震源破裂过程

Abstract

Abstract: The space-time rupture process of the March 2011 great northeast Japan earthquake is obtained by inversion of 1-Hz GPS data. The inversion compares observation waveforms with synthetic waveforms on the basis of ABIC method, yielding stable estimates of the slip distribution. The solution has concentrations of slip near the hypocenter, with maximum slip of ~72 m beneath the hypocenter of 30 km. There are two concentrations of smaller slip in Iwate and Fukushima close to the coast. The southern fault has general small slip, with the highest concentrations of aftershocks. The complete rupture consists of three main ruptures. After the initial break, the rupture propagates around from the hypocenter with small velocity, and then it expands to the trench within 50 s to 60 s. The large rupture occurs quickly beneath the hypocenter from 60 s to 90 s, forming the largest slip region. The main rupture propagates bilaterally up-dip and down-dip. From 90 s to 120 s, the rupture with small slip concentrates in the most northwestern area and in the southern half of the fault. The entire rupture almost ceases within 120 s. The solution of inversion suggests that the seismic moment is 3.8×10²² Nm, and the corresponding moment magnitude is M_W9.0.

Key words: 1-Hz GPS, ABIC, Rupture process, inversion, The 2011 northeast Japan earthquake

CLC Number:

P315

WANG Zhen, MENG Guo-jie, Yusuke Yokota, SU Xiao-ning. Inversion of 1-Hz GPS Waveform Data for Rupture Process of the 2011 Great Northeast Japan Earthquake[J]. EARTHQUAKE, 2013, 33(3): 13-23.

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Inversion of 1-Hz GPS Waveform Data for Rupture Process of the 2011 Great Northeast Japan Earthquake

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