Large aftershocks of the Maule 2010 mega earthquake in Central Chile
E. Buforn (1), C. Pro (2), A. Fuenzalida (3), S. Ruiz (4),
and R. Madariaga(3)
1.- Dpt. Geofísica y Meteorología, Universidad Complutense, Madrid (Spain)
2.- Dpt. De Física, Universidad de Extremadura, Mérida (Badajoz, Spain)
3.- Laboratoire de Geologie, Ecole Normale Superieure, Paris (France)
4.- Dpt. De Geofísica, Universidad de Chile, Santiago (Chile)
Last Mega earthquakes in Chile
A different vision:
Only mega earthquakes count
Other M~8 earthquakes Are just late aftershocks or foreshocks
Chile had 3 Mega earthquakes
In the last 100 years!
Aftershocks of the Maule 2010 earthquake
All events from local network
Best relocated aftershocks are very sparse
Relocaction
Rietbrock et al, 2012 |
Fuenzalida et al, 2013 |
Statistics of the Maule Mw 8.8 mega earthquake
Gutenberg Richter of aftershocks
gap
gap
Comparison of geodetic versus Far field inversion
Slip inverted from GPS |
Slip inverted from Far field body waves |
Moreno et al (EPSL, 2012) |
Our inversion |
|
Aftershocks scale very simply with main event
gap
Slip distribution for main event and aftershocks
Conclusions
The Maule Mw=8.8 earthquake had few aftershocks
Aftrshocks were sparsely distributed
A model of the main event was found that matches 
geodetic models
Rupture of the main event was bilateral with large slip North and South of the epicenter (Constitucion and Arauco)
Model of rupture is very different from that found with back propagation
Larger thrust aftershocks occurred in these two patches
2011/01/02
2011/02/11
Variación del buzamiento del plano de falla con la longitud
1 2010/02/27 (Main)
2 2010/02/27
3 2010/03/05
4 2010/03/11
5 2010/03/11 (14:55:30.9)
6 2010/03/16
7 2011/01/02
8 2011/02/11
9 2012/03/25