Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.u31b..08v&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #U31B-08
Physics
7215 Earthquake Source Observations (1240), 7230 Seismicity And Tectonics (1207, 1217, 1240, 1242), 8118 Dynamics And Mechanics Of Faulting (8004), 8163 Rheology And Friction Of Fault Zones (8034), 8170 Subduction Zone Processes (1031, 3060, 3613, 8413)
Scientific paper
Aspiring to see more intimate details, we placed an 84-element short-period vertical-component array with an aperture of 1km on a hard rock mountain over the path of Cascadia tremor. This site is coincident with a stellar 6-station three-component CAFE array (see talk by K. Creager). Texans, which are convenient to deploy but require recycling for fresh batteries every four days, recorded the seismograms. We recorded 8 days in March and 17 days in May 2008. We find most of the arrivals at high frequencies, especially in the stacks, are P-waves, due to the network constitution. The March week contains only six intermittent hours of tremor detectable by the usual envelope analysis of data from the regional network, but array beamforming shows much more continuous activity, and extending about a half day longer. We also pick up a later episode of weak tremor that contains probably the first glance of low-frequency earthquake in Cascadia (see abstract by J. Sweet). The May field season recorded full-blown tremor passing directly underneath in startling detail. The tremor source region in preliminary images is more compact than the cloud of locations determined from envelope correlation, but also with an apparently persistent patchwork of regions that do and do not generate tremor. Further analysis and future deployments with multiple dense arrays show great promise for getting to the bottom of the issue of tremor generation.
Creager Kenneth C.
Ghosh Arpita
Sweet J.
Vidale John E.
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