2012 IRIS Workshop

Rupture Branching of the 2012 M8.6 Sumatra Earthquake

Lingsen Meng: Caltech, Jean-Paul Ampuero: Caltech, Joann Stock: Caltech, Zacharie Duputel: Caltech, Yingdi Luo: Caltech, Victor Tsai: Caltech

Rupture of the 2012 M8.6 Sumatra earthquake as seen from Japanese Hi-net (left) and European seismic network (right). Colored circles and squares indicate the position of high-frequency radiation identified by MUSIC back-projection with size scaling with the beamforming amplitude and color indicating timing relative to hypocentral time (color scale on bottom-right). The background is colored by the satellite gravity anomaly (color scale on bottom-left). Black dots are the epicenters of the first day of aftershocks from the NEIC catalog. The big and small white stars indicate the hypocenter of the mainshock and M8.2 aftershock. The focal mechanism and centroid location of the M8.6 mainshock, M8.2 aftershock and double CMT solutions of the mainshock are shown in colored beach balls. Inset shows the interpreted fault planes (grey dashed lines) and rupture direction (colored arrows). Back-projection source imaging indicates the rupture occurs on multiple distinct planes in an orthogonal co

Full-resolution graphics file in original format: 0097.jpg

Acknoweldgements: This research was supported by NSF grant EAR-1015704, by the Gordon and Betty Moore Foundation and by the Southern California Earthquake Center, which is funded by NSF Cooperative Agreement EAR-0106924 and USGS Cooperative Agreement 02HQAG0008.

For further reading: Meng, L., A. Inbal, and J.-P. Ampuero (2011), A window into the complexity of the dynamic rupture of the 2011 Mw 9 Tohoku-Oki earthquake, Geophys. Res. Lett., 38, L00G07, doi:10.1029/2011GL048118. Meng, L., J.-P. Ampuero, J. Stock, Z. Duputel, Y. Luo, V.C. Tsai (2012), An earthquake in a maze: compressional rupture branching in a weakened oceanic lithosphere during the April 11 2012 M8.6 Sumatra earthquake, Submitted to Science. doi: 10.1029/2011GL048118

Keywords: back_projection, source_imaging, sumatra

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