GNSS Measurements of the January 2020 Puerto Rico Earthquake Sequence

Session: Early Results from the 2020 M6.4 Indios, Puerto Rico Earthquake Sequence [Poster]
Type: Poster
Date: 4/30/2020
Time: 08:00 AM
Room: Ballroom
Description: 

The January 7th 2020 M6.4 earthquake off the southwest shore of Puerto Rico was the largest event in a sequence that began with a M4.8 on December 28th 2019. The earthquakes occurred in a region bound by the on-shore Punta Montalva Fault and the offshore Guayanilla Canyon. As of mid-January 2020, it has included 10 events larger than M5. Displacements from the M6.4 event were recorded by several GNSS stations across Puerto Rico. In this presentation we show the high-rate dynamic signals measured by stations operated by the Puerto Rico Seismic Network and by UNAVCO as part of the Network of the Americas (NOTA). High-rate dynamic displacements can provide a reliable and rapid first estimate of the magnitude of an earthquake. In this presentation we analyze displacements recorded by the PRSN and NOTA networks to determine a magnitude and estimate how rapidly this magnitude would be available if all real-time position streams were flowing into a GNSS-augmented EEW system. We also compare the GNSS derived final offsets with those predicted by the seismic moment tensor.

Presenting Author: Alberto M. Lopez

Authors