Rapid estimation of rupture extent for large earthquakes: Application to the 2004, M9 Sumatra‐Andaman mega‐thrust

[1] Rapid estimation of the rupture extent of large earthquakes is critical for tsunami warning and emergency response. The hypocenter of a distant earthquake is determined from the first seismic P waves within about 15 minutes after the event. However, methods for determining the size and rupture extent of very large earthquakes rely on long period recordings and aftershock locations, which are not available until several hours or more after the event. Here we introduce a method for rapid estimation of the rupture termination location for large earthquakes based on short period, P-wave recordings, available about 30 minutes after an event. The hypocenter and the rupture termination location provide estimates of the extent of rupture and the event size. Application to the 2004, M9 Sumatra-Andaman earthquake gives a rupture termination location near the Andaman Islands, about 1100 km north of the hypocenter, and a rupture duration of about 8 minutes.

[1]  Jean Virieux,et al.  Probabilistic Earthquake Location in 3D and Layered Models , 2000 .

[2]  Peter M. Shearer,et al.  Introduction to Seismology , 2019 .

[3]  John H. Woodhouse,et al.  Determination of earthquake source parameters from waveform data for studies of global and regional seismicity , 1981 .

[4]  Göran Ekström,et al.  Rapid earthquake analysis utilizes the Internet , 1994 .

[5]  Massimo Cocco,et al.  The envelopes of acceleration time histories , 1993 .

[6]  E. R. Engdahl,et al.  Constraints on seismic velocities in the Earth from traveltimes , 1995 .

[7]  John Milne,et al.  Earthquakes and other Earth Movements , 1913, Nature.

[8]  Hitoshi Kawakatsu,et al.  Automated near‐realtime CMT inversion , 1995 .

[9]  A. Roueff,et al.  Use of hydroacoustic and seismic arrays to observe rupture propagation and source extent of the Mw = 9.0 Sumatra earthquake , 2005 .

[10]  S. Beck,et al.  The June 23, 2001 Peru earthquake and the southern Peru subduction zone , 2001 .

[11]  Lisa A. Wald,et al.  Rupture in south-central Alaska; the Denali Fault earthquake of 2002 , 2003 .

[12]  Jean Virieux,et al.  Precise, absolute earthquake location under Somma–Vesuvius volcano using a new three-dimensional velocity model , 2001 .

[13]  Hua-wei Zhou,et al.  Rapid three‐dimensional hypocentral determination using a master station method , 1994 .

[14]  A. Gusev,et al.  Deconvolution of squared velocity waveform as applied to the study of a noncoherent short-period radiator in the earthquake source , 1991 .

[15]  Keiiti Aki,et al.  Mapping of the high-frequency source radiation for the Loma Prieta Earthquake, California , 1993 .

[16]  Anthony Lomax,et al.  A Reanalysis of the Hypocentral Location and Related Observations for the Great 1906 California Earthquake , 2005 .

[17]  C. Scholz.  The Mechanics of Earthquakes and Faulting , 1990 .

[18]  L. Gahagan,et al.  Present-day Plate Boundary Digital Data Compilation , 1997 .

[19]  N. H. Heck.  The Fifthieth Year of the Journal , 1945 .

[20]  A.,et al.  Inverse Problems = Quest for Information , 2022 .

[21]  H. Kao,et al.  Hypocentre determination offshore of eastern Taiwan using the Maximum Intersection method , 2004 .