Publication Date:
2017-04-04
Description:
Nonvolcanic tremor is difficult to locate because it does not produce impulsive phases identifiable
across a seismic network. An alternative approach to identifying specific phases is to measure
the lag between the S and P waves. We cross-correlate vertical and horizontal seismograms to
reveal signals common to both, but with the horizontal delayed with respect to the vertical. This
lagged correlation represents the time interval between vertical compressional waves and
horizontal shear waves. Measurements of this interval, combined with location techniques, resolve
the depth of tremor sources within T2 kilometers. For recent Cascadia tremor, the sources
locate near or on the subducting slab interface. Strong correlations and steady S-P time differences
imply that tremor consists of radiation from repeating sources.
Description:
Published
Description:
620-623
Description:
3.1. Fisica dei terremoti
Description:
3.2. Tettonica attiva
Description:
3.3. Geodinamica e struttura dell'interno della Terra
Description:
JCR Journal
Description:
reserved
Keywords:
Cascadia Tremor
;
Plate Interface Constrained
;
04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics
;
04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
;
04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics
;
04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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