Short-Period Rupture Process of the 2010 Mw 8.8 Maule Earthquake in Chile

The 2010 Maule earthquake is one of the largest events ever recorded with modern instruments. We used the continuous GPS (cGPS) records to invert for the kinematic rupture process using an elliptical sub-patch approximation. In agreement with previous inversions, the largest slip is found in the northern part of the rupture zone. By cross-correlating signals from cGPS and strong motion records (SM) located in the northern part of the rupture zone, we identified two distinct seismic pulses. Using the arrival time of these pulses, we propose a short-period (<20 s) rupture process, the zone where these pulses are generated is situated near 35.5°S, in agreement with the area with the highest seismic slip and maximum observed intensity. Finally, we compare the strong motion records at the same sites for the 1985 Mw 8 Valparaíso earthquake and the Maule earthquake. We found that spectral contents and duration of the records of these two events were very similar. Thus, at least in the northern part of the rupture, the Maule earthquake radiated high frequency waves like an Mw 8 earthquake.

[1]  James Foster,et al.  Coseismic slip distribution of the February 27, 2010 Mw 8.8 Maule, Chile earthquake , 2011 .

[2]  Central Chile finally breaks , 2010 .

[3]  Masanobu Shimada,et al.  The 2010 Maule, Chile earthquake: Downdip rupture limit revealed by space geodesy , 2010 .

[4]  Jonathan P. Stewart,et al.  Strong Ground Motion Attributes of the 2010 Mw 8.8 Maule, Chile, Earthquake , 2012 .

[5]  S. K. Singh,et al.  The 1985 Central Chile Earthquake: A Repeat of Previous Great Earthquakes in the Region? , 1986, Science.

[6]  Hermann M. Fritz,et al.  Field Survey of the 27 February 2010 Chile Tsunami , 2011 .

[7]  M. Vallée,et al.  Imaging coseismic rupture in far field by slip patches , 2004 .

[8]  M. Bevis,et al.  Heterogeneous plate locking in the South–Central Chile subduction zone: Building up the next great earthquake , 2011 .

[9]  J. Mori,et al.  Frequency‐dependent energy radiation and fault coupling for the 2010 Mw8.8 Maule, Chile, and 2011 Mw9.0 Tohoku, Japan, earthquakes , 2011 .

[10]  T. Heaton.  Evidence for and implications of self-healing pulses of slip in earthquake rupture , 1990 .

[11]  J. Nocquet,et al.  Slip distribution of the February 27, 2010 Mw = 8.8 Maule Earthquake, central Chile, from static and high‐rate GPS, InSAR, and broadband teleseismic data , 2010 .

[12]  Tso-Ren Wu,et al.  High resolution tsunami inversion for 2010 Chile earthquake , 2011 .

[13]  Hiroo Kanamori,et al.  Seismological aspects of the Guatemala Earthquake of February 4, 1976 , 1978 .

[14]  R. Madariaga,et al.  Identification of High Frequency Pulses from Earthquake Asperities Along Chilean Subduction Zone Using Strong Motion , 2011 .

[15]  E. R. Engdahl,et al.  41 - Global Seismicity: 1900–1999 , 2002 .

[16]  M. Bouchon.  A simple method to calculate Green's functions for elastic layered media , 1981 .

[17]  Hiroo Kanamori,et al.  Teleseismic inversion for rupture process of the 27 February 2010 Chile (Mw 8.8) earthquake , 2010 .

[18]  Hiroo Kanamori,et al.  Frequency-dependent rupture process of the 2011 Mw 9.0 Tohoku Earthquake: Comparison of short-period P wave backprojection images and broadband seismic rupture models , 2011 .

[19]  M. Ishii,et al.  The 2010 Mw 8.8 Chile earthquake: Triggering on multiple segments and frequency‐dependent rupture behavior , 2011 .

[20]  John McCloskey,et al.  Limited overlap between the seismic gap and coseismic slip of the great 2010 Chile earthquake , 2011 .

[21]  Sergio Ruiz,et al.  Damage Assessment and Seismic Intensity Analysis of the 2010 (Mw 8.8) Maule Earthquake , 2012 .

[22]  R. Madariaga,et al.  The 2010 Mw 8.8 Maule Megathrust Earthquake of Central Chile, Monitored by GPS , 2011, Science.

[23]  Y. Yagi,et al.  Rupture process and coseismic deformations of the 27 February 2010 Maule earthquake, Chile , 2011 .

[24]  George W. Housner.  An engineering report on the Chilean earthquakes of May 1960: Preface , 1963 .

[25]  E. Yoffe,et al.  LXXV. The moving griffith crack , 1951 .

[26]  E. Yoffe,et al.  The moving Griffith crack , 1951 .

[27]  M. Sambridge.  Geophysical inversion with a neighbourhood algorithm—I. Searching a parameter space , 1999 .

[28]  R. Madariaga,et al.  A seismological study of the 1835 seismic gap in south-central Chile , 2002 .

[29]  Raul Madariaga,et al.  Dynamic inversion of the 2000 Tottori earthquake based on elliptical subfault approximations , 2010 .

[30]  Jean-Paul Ampuero,et al.  A window into the complexity of the dynamic rupture of the 2011 Mw 9 Tohoku‐Oki earthquake , 2011 .