Publication Date:
2016-03-19
Description:
W-phase moment tensor inversion has proven to be a reliable method for rapid characterization of large earthquakes. For global purposes it is used at the USGS (United States Geological Survey), PTWC (Pacific Tsunami Warning Center) and IPGS (Institut de Physique du Globe de Strasbourg). These implementations provide moment tensors within 30-60 min after the origin time of moderate and large worldwide earthquakes. Currently, the method relies on broadband seismometers, which clip in the near field. To ameliorate this, we extend the algorithm to regional records from high-rate GPS data and retrospectively apply it to six large earthquakes that occurred in the past five years in areas with relatively dense station coverage. These events show that the solutions could potentially be available 4-5 minutes from origin time. Continuously improving GPS station availability and real time positioning solutions will provide significant enhancements to the algorithm.
Print ISSN:
0094-8276
Electronic ISSN:
1944-8007
Topics:
Geosciences
,
Physics
