English
 
Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
Add to Basket
  Local TagsRelease HistoryDetailsSummary

Released
Conference Paper

Underplating evidence on Mejillones Peninsula zone, Chile

Authors
/persons/resource/landaeta

Parraguez Landaeta,  Begona Fernanda
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
4.1 Lithosphere Dynamics, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/schurr

Schurr,  B.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
4.1 Lithosphere Dynamics, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Kummerow,  Jörn
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Salazar,  Pablo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Sippl,  Christian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in GFZpublic
Supplementary Material (public)
There is no public supplementary material available
Citation

Parraguez Landaeta, B. F., Schurr, B., Kummerow, J., Salazar, P., Sippl, C. (2023): Underplating evidence on Mejillones Peninsula zone, Chile, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1672


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017929
Abstract
Mejillones peninsula located in the north of Chile is considered a potential seismic barrier. Two major earthquakes have occurred south and north of it: The M8.1 1995 Antofagasta and the M7.8 2007 Tocopilla earthquakes. Slip and aftershock distribution show the central axis of this peninsula as the limit. We use travel time data of earthquakes recovered by three networks, overlapping in space but not in time, including offshore stations (CINCA network 1995; TaskForce 2007, and MEJIPE 2013-2015). A three-dimensional local tomographic inversion was performed using ~4000 events. The resolution of tomographic images was analysed by the model resolution matrix and numerical tests. Vp velocity and Vp/Vs ratio images are capable of resolving main tectonic units up to 80 km depth. Our work shows the presence of two basal possible underplating structures: The first is located below the peninsula with similar dimensions of it (~60 km) found at depths > 35 km and a second structure of smaller dimensions is located to the north where the Tocopilla earthquake nucleated. This evidence justifies the possible segmentation in the rupture zones of both earthquakes in the north of Chile.