Item talk:Q236719
From geokb
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"name": "Investigation of the high-frequency attenuation parameter, \u03ba (kappa), from aftershocks of the 2010 Mw 8.8 Maule, Chile earthquake",
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"abstract": "The B\u00edo B\u00edo region of Chile experienced a vigorous aftershock sequence following the 2010 February 27\u00a0Mw\u00a08.8 Maule earthquake. The immediate aftershock sequence was captured by two temporary seismic deployments: the Quake Catcher Network Rapid Aftershock Mobilization Program (QCN RAMP) and the Incorporated Research Institutions for Seismology CHile Aftershock Mobilization Program (IRIS CHAMP). Here, we use moderate to large aftershocks (ML\u00a0\u2265 4.0) occurring between 2010 March 1 and June 30 recorded by QCN RAMP and IRIS CHAMP stations to determine the spectral decay parameter, kappa (\u03ba). First, we compare waveforms and\u00a0\u03ba\u00a0estimates from the lower-resolution QCN stations to the IRIS CHAMP stations to ensure the QCN data are of sufficient quality. We find that QCN stations provide reasonable estimates of\u00a0\u03ba\u00a0in comparison to traditional seismic sensors and provide valuable additional observations of local ground motion variation. Using data from both deployments, we investigate the variation in\u00a0\u03ba\u00a0for the region to determine if\u00a0\u03ba\u00a0is influenced primarily by local geological structure, path attenuation, or source properties (e.g. magnitude, mechanism and depth). Estimates of\u00a0\u03ba\u00a0for the B\u00edo B\u00edo region range from 0.0022 to 0.0704 s with a mean of 0.0295 s and are in good agreement with\u00a0\u03ba\u00a0values previously reported for similar tectonic environments.\u00a0\u03ba\u00a0correlates with epicentral distance and, to a lesser degree, with source magnitude. We find little to no correlation between the site kappa, \u03ba0, and mapped geology, although we were only able to compare the data to a low-resolution map of surficial geology. These results support an increasing number of studies that suggest\u00a0\u03baobservations can be attributed to a combination of source, path and site properties; additionally, measured\u00a0\u03ba\u00a0are often highly scattered making it difficult to separate the contribution from each of these factors. Thus, our results suggest that contributions from the site, path and source should be carefully considered when interpreting\u00a0\u03ba\u00a0values.",
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