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Investigating the final seismic swarm before the Iquique-Pisagua 2014 Mw 8.1 by comparison of continuous GPS and seismic foreshock data

Authors
/persons/resource/jbed

Bedford,  Jonathan
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
IPOC, External Organizations;
GEOFON, Deutsches GeoForschungsZentrum;

/persons/resource/marcos

Moreno,  M.
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
IPOC, External Organizations;
GEOFON, Deutsches GeoForschungsZentrum;

/persons/resource/schurr

Schurr,  B.
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
IPOC, External Organizations;
GEOFON, Deutsches GeoForschungsZentrum;

/persons/resource/mitja

Bartsch,  Mitja
1.1 GPS/GALILEO Earth Observation, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
IPOC, External Organizations;
GEOFON, Deutsches GeoForschungsZentrum;

/persons/resource/oncken

Oncken,  O.
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
IPOC, External Organizations;
GEOFON, Deutsches GeoForschungsZentrum;

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1113903.pdf
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Citation

Bedford, J., Moreno, M., Schurr, B., Bartsch, M., Oncken, O. (2015): Investigating the final seismic swarm before the Iquique-Pisagua 2014 Mw 8.1 by comparison of continuous GPS and seismic foreshock data. - Geophysical Research Letters, 42, 10, 3820-3828.
https://doi.org/10.1002/2015GL063953


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1113903
Abstract
Preexisting networks of seismometers and continuous GPS in Northern Chile successfully captured surface motions and seismicity leading up to the 1 April Mw 8.1. Here we compare continuous GPS (cGPS) with predictions of seismic dislocations for the final foreshock swarm, beginning with the 16 March Mw 6.7. Results show that the cumulative cGPS motion can be largely explained by seismic slip because evolutions of cGPS positions for most stations stay within the ranges of seismic predictions (given sensible ranges of assumed source errors). However, cGPS motions between 18–21 and 25–31 March outpace seismic predictions, supporting the existence of aseismic transients that were most probably the afterslip from preceding bursts of seismicity. A parameter search reveals that the 16 March Mw 6.7 cGPS displacements can be recreated with a fault plane significantly rotated anticlockwise from the strike of the plate interface, suggesting that failure was on a structure other than the plate interface.