%0 Journal Article %1 chu_etal:2011 %A Chu, Risheng %A Wei, Shengji %A Helmberger, Don V. %A Zhan, Zhongwen %A Zhu, Lupei %A Kanamori, Hiroo %D 2011 %J Earth and Planetary Science Letters %K geophysics seismology %N 3-4 %P 277--283 %R 10.1016/j.epsl.2011.06.031 %T Initiation of the great Mw 9.0 Tohoku-Oki earthquake %U http://dx.doi.org/10.1016/j.epsl.2011.06.031 %V 308 %X We determined the location, size, mechanism, and the frequency content of the first 4.0 s of the 2011 Tohoku-Oki earthquake. Since the beginning of this earthquake is very small, we develop a comparative approach against a near-by reference earthquake, the master event. We first determined the water depth near the master event using the differential timing between the water phase pwP reflected from the air-water interface and the depth phase pP reflected from the water-crust interface. Then we located the master event using the well-known ocean bathymetry in the area. After calibrating teleseismic arrays (D = 30 to 90 deg) at short periods for timing and amplitude with respect to the master event, we were able to determine the initiation of the main event. It began as a small (Mw = 4.9) thrust event located at 38.19N, 142.68E at a depth of 21 km, and, a few seconds later, evolved into a slower extremely large slip event up-dip.

@article{chu_etal:2011, abstract = {We determined the location, size, mechanism, and the frequency content of the first 4.0 s of the 2011 Tohoku-Oki earthquake. Since the beginning of this earthquake is very small, we develop a comparative approach against a near-by reference earthquake, the master event. We first determined the water depth near the master event using the differential timing between the water phase pwP reflected from the air-water interface and the depth phase pP reflected from the water-crust interface. Then we located the master event using the well-known ocean bathymetry in the area. After calibrating teleseismic arrays (D = 30 to 90 deg) at short periods for timing and amplitude with respect to the master event, we were able to determine the initiation of the main event. It began as a small (Mw = 4.9) thrust event located at 38.19N, 142.68E at a depth of 21 km, and, a few seconds later, evolved into a slower extremely large slip event up-dip.}, added-at = {2012-09-01T13:08:21.000+0200}, author = {Chu, Risheng and Wei, Shengji and Helmberger, Don V. and Zhan, Zhongwen and Zhu, Lupei and Kanamori, Hiroo}, biburl = {https://www.bibsonomy.org/bibtex/236dd08fe80b12878782c010bbd731826/nilsma}, doi = {10.1016/j.epsl.2011.06.031}, interhash = {3e875b43c62142312a6ab7fcdb113f4e}, intrahash = {36dd08fe80b12878782c010bbd731826}, issn = {0012821X}, journal = {Earth and Planetary Science Letters}, keywords = {geophysics seismology}, month = aug, number = {3-4}, pages = {277--283}, timestamp = {2021-02-09T13:26:37.000+0100}, title = {Initiation of the great Mw 9.0 Tohoku-Oki earthquake}, url = {http://dx.doi.org/10.1016/j.epsl.2011.06.031}, volume = 308, year = 2011 }