Ground motion observations and simulation for local earthquakes in the Campi Flegrei volcanic area
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- 作者：Danilo Galluzzo ; Francesca Bianco ; Mario La Rocca…
- 刊名：Bulletin of Earthquake Engineering
- 出版年：2016
- 出版时间：July 2016
- 年：2016
- 卷：14
- 期：7
- 页码：1903-1916
- 全文大小：1,729 KB
- 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Geotechnical Engineering
Civil Engineering
Geophysics and Geodesy
Hydrogeology
Structural Geology - 出版者：Springer Netherlands
- ISSN：1573-1456
- 卷排序：14
文摘
Ground motion produced by low magnitude earthquakes can be used to predict peak values in high seismic risk areas where large earthquakes data are not available. In the present work 20 local earthquakes (MD∈[−0.3, 2.2]) occurred in the Campi Flegrei caldera during the last decade were analyzed. We followed this strategy: empirical relations were used to calibrate synthetic modeling, accounting for the source features and wave propagation effects. Once the source and path parameters of ground motion simulation were obtained from the reference data set, we extrapolated scenarios for stronger earthquakes for which real data are not available. The procedure is structured in two steps: (1) evaluation of ground motion prediction equation for Campi Flegrei area and assessment of input parameters for the source, path and site effects in order to use the finite fault stochastic approach (EXSIM code); (2) simulation of two moderate-to-large earthquake scenarios for which only historical data or partial information are available (Mw4.2 and Mw5.4). The results show that the investigated area is characterized by high attenuation of peak amplitude and not negligible site effects. The stochastic approach has revealed a good tool to calibrate source, path and site parameters on small earthquakes and to generate large earthquake scenario. The investigated magnitude range represents a lower limit to apply the stochastic method as a calibration tool, due to the small size of involved faults (fault length around 200/300 m).KeywordsStochastic simulationPeak velocityCampi Flegrei