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The Chilean Seismic Network: An Update

Description: 

More than 500 instruments (accelerometers, BB, and GNSS devices), comprise the National Seismic Network, of which 118 are six-component (BB + strong ground motion) transmitting their data in real-time to the Data Center. The network includes two devices installed on the Chilean Pacific Islands, one station in the Antarctic Peninsula, and those stations that are part of the Integrated Plate Boundary Observatory in northern Chile (IPOC).

The main mission of the CSN is to rapidly characterize -within 5 minutes of O.T.- the location and size of earthquakes M≥3.7, particularly those that could generate tsunamis. Because the main thrust region is mostly concentrated between the trench and the coast, with an average width of about 150 km, the monitoring system is distributed all along the country and includes real-time GNSS capabilities, both on-site position estimations as well as at a central server, based on Precise Point Positioning techniques. In near-real-time applications, as well as in the near field, unsaturated direct-displacement-estimations based on GNSS observations become critical for the determination of fault finiteness of M ~ 7 (or larger) earthquakes that affect the coastal part of the country, with their associated significant tsunamigenic potential. GNSS records also facilitate more robust estimates of magnitude and W-phase solutions, as well as finite fault models.

This network allows the detection of M>3 earthquakes along the country, including regions not previously monitored permanently. Additional efforts are concentrated on EEW for central Chile and, during 2023, we installed three DAS systems (fiber-optic seismology) with Geoazur to increase the observation capabilities underwater, where most of the large-magnitude seismicity is generated.

Session: Network Seismology: Recent Developments, Challenges and Lessons Learned - I

Type: Oral

Date: 5/1/2024

Presentation Time: 02:30 PM (local time)

Presenting Author: Sergio

Student Presenter: No

Invited Presentation: 

Authors