W-phase solutions can be computed at both regional (~5 to ~20 degrees) and tele seismic (~30 to ~90 degrees) distances, though the majority of solutions are tele seismic. The W-phase is evident between the P- and Surface-waves on broadband displacement records. Moment magnitude derived from a centroid moment tensor (CMT) inversion of the W-phase, a very long period phase (~100 - 1000 s) arriving at the same time as the P-wave. The dots represent the axis of maximum compressional strain (in black, called the "P-axis") and the axis of maximum extensional strain (in white, called the "T-axis") resulting from the earthquake. Shaded areas show quadrants of the focal sphere in which the P-wave first-motions are away from the source, and unshaded areas show quadrants in which the P-wave first-motions are toward the source. The moment tensor image shows a visual representation of the style of faulting (focal mechanism) derived from the estimated moment tensor. The tensor depends on the source strength and fault orientation. The dots represent the axis of maximum compressional strain (in black, called the "P-axis") and the axis of maximum extensional strain (in white, called the "T-axis") resulting from the earthquake.Ī mathematical representation of the movement on a fault during an earthquake. The focal mechanism image shows a visual representation of the style of faulting (focal mechanism) derived from the estimated moment tensor. USHIS - Stover and Coffman, Seismicity of the United States, 1568-1989 USGS National Earthquake Information Center, PDE Lamont-Doherty Cooperative Seismographic NetworkĬalifornia Integrated Seismic Network: Northern California Seismic System (UC Berkeley, USGS Menlo Park, and Partners)Ĭenter for Earthquake Research and Information Lamont-Doherty Earth Observatory Global CMT project, New York, USA Sources of Data - Catalogs and Real-timeĭata Availability as of Tue, 20:39:11 GMT CatalogĬalifornia Integrated Seismic Network: Southern California Seismic Network (Caltech/USGS Pasadena and Partners) and Southern California Earthquake Data CenterĮQH - Coffman, von Hake and Stover, Earthquake History of the United States.Contribute and Receive Data - PDL (GitHub).
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