ABSTRACT

W‐phase algorithm has been proven to be a reliable and robust method to calculate the centroid moment tensor (CMT) for moderate and large earthquakes. For global purposes, the W‐phase algorithm is operating in real time at the National Earthquake Information Center (NEIC), the Institut de Physique du Globe de Strasbourg (IPGS), and Pacific Tsunami Warning Center (PTWC). Regional implementations are operating in Japan, Mexico, Australia, Taiwan, China, and Chile. In Chile, it has been implemented at the National Seismological Center (CSN) since 2011 for regional distances, obtaining accurate results of more than 300 events, while more than 100 broadband seismometers have been installed and incorporated by CSN. We compared our solutions with NEIC W‐phase moment tensor results and with the Global CMT. The threshold W‐phase magnitude for earthquakes occurred in Chile moved from Mw 6.5 with 36 broadband stations in 2012 to 4.8 with 106 stations along the country, producing a catalog that can be used for both operational and scientific purposes. If more stations and seismic data are available, it will be possible to characterize earthquakes faster and more accurately. For tsunami early warning purposes, collaboration among regional networks will be essential to issue fast tsunami warnings.

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