Earthquake, 27 February 2010 06:35 UTC, Latitude 35.846°S,Longitude 72.719°W, 8.0, Depth 35 km (USGS).
If you have data or results that you would like to post on this webpage, please e-mail Falk Amelung, the Task Leader of GEO's Supersite initiative (famelung@rsmas.miami.edu) or Susanna Gross (sjg@unavco.org).
Please include a kmz file as they are convenient to use in the field.
Instrumental intensity from the USGS:
Ben Brooks contributed two maps of coseismic and postseismic displacements plotted with
inter-seismic velocities measured with GPS.
A map showing interseismic velocities (yellow) and Maule co-seismic
displacement (red) for the M8.8 Chile earthquake. Ben Brooks, James Foster, Mike Bevis,
Bob Smalley, Hector Parra, Juan Carlos Baez Soto, Mauro Blanco, Eric Kendrick, Jeff
Genrich, and Dana Caccamise.
A map showing interseismic velocities (yellow), post-seismic displacement from
existing stations (red), and locations of installed NSF RAPID stations for which
velocities are forthcoming (pink squares). Ben Brooks, James Foster, Mike Bevis, Bob
Smalley, Hector Parra, Juan Carlos Baez Soto, Mauro Blanco, Eric Kendrick, Jeff
Genrich, and Dana Caccamise.
Simon Banville, working for Richard Langley at the University of New Brunswick has prepared plots of ground motion from GPS station CONZ, one of which is shown below:
longer time scale
shorter time scale
Fred Pollitz has prepared a map of the co-seismic displacement field
The above figure compares observed GPS static offsets (courtesy J.Foster,
B.Brooks, Project CAP) with the predictions of a uniform-slip model.
This model involves 5m slip on a 600 km long plane (shown as a composite
of 12 sub-planes) extending from 60 km to the surface. Following the
global CMT solution, the fault dips 18 deg toward the East and strikes
N17.5E, and the slip vector has a rake of 112 deg. The uniform
dislocation is imposed on the PREM model and calculated in a spherical
geometry (Pollitz, 1996). The amplitude of the displacement field is
matched well in the far field -- suggesting that the average slip of the
earthquake is close to the assumed value of 5m. The data considered so
far indicate that slip in the northern part is somewhat less than 5m,
and slip is likely variable over the considered fault surface.
UNAVCO Data Archive Interface for this region.
Yanlu Ma, Xiaohui Yuan and Rainer Kind of GFZ Potzdam have created an animated gif of the rupture sequence.
A map by LIA Montessus de Ballore (CNRS-INSU and Univ. de Chile) and IPGP tectonics lab (R. Lacassin) showing the event in the context of historical seismicity:
Click on the sample image above to get the the full regional map.
Aftershock map, 3 May 2010 (UNAVCO)
IRIS
Damage Map
Mean damage in all settlements affected, created by WAPMERR
US Geological Survey
Source Model
ALOS PALSAR data provided by JAXA throuth the ASF and processed using GMTSAR
Xiaopeng Tong (xitong@ucsd.edu) and David Sandwell (dsandwell@ucsd.edu)
Preliminary coseismic slip model from joint inversion of InSAR and GPS data. The dominant sense of motion is thrust along with minor right-slip. Most of the moment is released from the surface to 150 km down-dip, corresponding to 38.8 km in depth, which means most of the moment is released above the depth of Moho. The most intensive slip area (> 19 m) is at the northern part of the fault, about 170 km north of the epicenter. GPS data is courtesy of Ben Brooks, James Foster, Mike Bevis, Bob Smalley, Hector Parra, Juan Carlos Soto, Eric Kendrick, Jeff Genrich.
The line-of sight ALOS InSAR data are also provided. These ascii data are unwrapped, subsampled, and calibrated using the GPS data in the region. ftp://topex.ucsd.edu/pub/chile_eq/chile_insar.zip
Please see Anthony's Sladen's page for details.
Stress Transfer
These plots of stresses transferred from the 1960 and 2010 events were made by J. Lin, R. Stein and S. Toda.
