Spectral Scaling and Seismic Efficiency for Earthquakes in Northeast India
| Autor: | N. Subhadra, Simanchal Padhy |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Selection bias
010504 meteorology & atmospheric sciences Estimation theory media_common.quotation_subject Attenuation Bandwidth (signal processing) Mechanics Dissipation 010502 geochemistry & geophysics 01 natural sciences Antenna efficiency Geophysics Geochemistry and Petrology Bandwidth limitation Scaling Geology Seismology 0105 earth and related environmental sciences media_common |
| Zdroj: | Bulletin of the Seismological Society of America. 106:1613-1627 |
| ISSN: | 1943-3573 0037-1106 |
| Popis: | We examine the scaling of spectral properties of 122 local earthquakes (2.6 that is proportional to stress drop independent of any particular fault geometry and by considering the measurement bias. For the events used in this study, the value of C r is close to 2.0, a value expected for circular crack model and self‐similar source scaling. However, the relatively large uncertainties due to earthquake selection bias and recording bandwidth limitation suggest caution in drawing conclusions from these findings. The events are grossly characterized by low and almost constant value of radiation efficiency and positive overshoot corresponding to an increase in relative dynamic strength, suggesting the importance of energy dissipation during the rupture process. Although the scaling of radiated energy and stress drop, as obtained here, takes into account as much as possible the effects of finite bandwidth, attenuation, and site corrections, the limited event selection may strongly bias it. An improvement over the present scaling is suggested with an improved seismic network in the region and also with the use of a stable empirical Green’s function approach for source parameter estimation. [1]: /embed/inline-graphic-1.gif |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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