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http://hdl.handle.net/2122/1944
DC Field | Value | Language |
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dc.contributor.authorall | Gallovic, F.; Department of Geophysics, Faculty of Mathematics and Physics, Charles University, Prague, V Holesovickach 2, Prague 8, 180 00, Czech Republic | en |
dc.contributor.authorall | Burjanek, J.; Department of Geophysics, Faculty of Mathematics and Physics, Charles University, Prague, V Holesovickach 2, Prague 8, 180 00, Czech Republic | en |
dc.date.accessioned | 2006-12-06T16:09:55Z | en |
dc.date.available | 2006-12-06T16:09:55Z | en |
dc.date.issued | 2006-12-06T16:09:55Z | en |
dc.identifier.uri | http://hdl.handle.net/2122/1944 | en |
dc.description.abstract | We are investigating two distinct strong ground motion simulation techniques as regards their high-frequency directivity: i) the composite model with a fractal subevent size dis- tribution, based on the method of summation of empirical Green’s functions, and ii) the integral model with the k-squared slip model with k-dependent rise time, based on the representation theorem. We test the simulations in a 1D layered crustal model against em- pirical PGA attenuation relations, particularly with regard to their uncertainty, described by the standard deviation ( ). We assume that any synthetic model for a particular earth- quake should not provide a PGA scatter larger than the observed scatter for a large set of earthquakes. The 1999 Athens earthquake (Mw=5.9) is studied as a test example. In the composite method, the synthetic data display a scatter of less than ±2 around the empirical mean. The k-squared method displays a larger scatter, demonstrating strong high-frequency directivity. It is shown that the latter can be reduced by introducing a formal spectral modification. 1 Introduction Low-frequency directivity effects are well known. For example, there is a number of seismic recordings of recent earthquakes (e.g., 1992 Landers, 1994 Northridge, 1995 Kobe, 1999 Chi-Chi), which show long-period velocity pulses caused by rupture propagation towards a station. This effect can be successfully explained by the apparent source time function varying with azimuth (Haskell, 1964). 2 | en |
dc.format.extent | 8493508 bytes | en |
dc.format.mimetype | null | en |
dc.language.iso | English | en |
dc.subject | directivy, strong ground motions | en |
dc.title | High-Frequency Directivity in Strong Ground Motion Modeling Methods | en |
dc.type | manuscript | en |
dc.description.status | Unpublished | en |
dc.subject.INGV | 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics | en |
dc.subject.INGV | 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion | en |
dc.description.fulltext | open | en |
dc.contributor.author | Gallovic, F. | en |
dc.contributor.author | Burjanek, J. | en |
dc.contributor.department | Department of Geophysics, Faculty of Mathematics and Physics, Charles University, Prague, V Holesovickach 2, Prague 8, 180 00, Czech Republic | en |
dc.contributor.department | Department of Geophysics, Faculty of Mathematics and Physics, Charles University, Prague, V Holesovickach 2, Prague 8, 180 00, Czech Republic | en |
item.openairetype | manuscript | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.classification.parent | 04. Solid Earth | - |
Appears in Collections: | Manuscripts |
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File | Description | Size | Format | |
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Gallovic.Burjanek.Directivity.zip | 8.29 MB | zip | View/Open |
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