Subduction Dynamics in the Arica Gap
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Subduction Dynamics in the Arica Gap
Target of opportunity
To develop a collaborative effort with geologists and geophysicists at the U. of Chile to understand the dynamics of subduction in N. Chile and S. Peru.
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The Arica Gap
Mejillones Peninsula and Atacama Desert viewed from Apollo
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1995 Mw 8.1 postseismic slip history
Pritchard and Simons, 2004Combining seismology, GPS, and InSAR
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Rationale for a CGPS network:
All “locked” SZ instrumented with CGPS have seen aseismic transients, InSAR sees hints of it in Chile.
Existing CGPS network in Chile/Peru too sparse to detect coherent transient motions
Long term strain and relationship to volcanism and slab geometry - Is there extension in the shallow crust in the Plateau?
Plateau Uplift rates (geodetic)?
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Other motivations/targets (speak up):
Structure, fluids, melt…
Permanent vs. elastic strain
•Coastal terraces
•Uplift rates (geologic/geodetic)
Role of slab geometry
Role of sediment flux
Volcanic flux/magma storage?
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100% Field Exposure
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Who is interested?
Specific activities?
Existing Data?
Seismic
InSAR
Geologic
Geochronologic
Petrologic
New data (Chilean priorities)?
CGPS
Field geology
Seismic deployments
How to Proceed?
We can look at maps now and return in a week after people have thought about it and possibly done some relevant homework