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Geo-Characterization at selected accelerometric stations in Crete (Greece) and comparison of earthquake data recordings with EC8 elastic spectra 总被引：1，自引：0，他引：1
A. Savvaidis B. Margaris N. Theodoulidis V. Lekidis Ch. Karakostas C. Loupasakis D. Rozos P. Soupios M. -D. Mangriotis U. Dikmen Par. Tsangaratos E. Kokinou A. Vafidis Th. Rondoyanni I. Kalogeras S. Koutrakis A. Sarris N. Papadopoulos 《Central European Journal of Geosciences》2014,6(1):88-103
To estimate the seismic response according to Eurocode (EC8) and almost all other national codes, site conditions have to be properly characterized so that soil amplification and the corresponding peak ground motion can be calculated. In this work, different geophysical and geotechnical methods are combined in order to define the detailed ground conditions in selected sites of the Hellenic Accelerometric Network (HAN) in Crete. For this purpose, the geological information of the sites and shear wave velocity, calculated from surface wave measurements, is used. Additionally, ground acceleration data recorded through HAN have been utilized from intermediate depth earthquakes in the broader area of South Aegean Sea. Using the recorded ground motion data and the procedure defined in EC8, the corresponding elastic response spectrum is calculated for the selected sites. The resulting information is compared to the values defined in the corresponding EC8 spectrum for the seismic zone that includes the island of Crete. The comparison shows that accurate definition of ground type through geological, geotechnical and geophysical investigations is important. However, our current comparison focuses on the distribution of values rather than the absolute values of EC8-prescribed spectra, and the results should be considered in this context. 相似文献
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M. Sachpazi Ch. Kontoes N. Voulgaris M. Laigle G. Vougioukalakis Olga Sikioti G. Stavrakakis J. Baskoutas J. Kalogeras J. Cl. Lepine 《Journal of Volcanology and Geothermal Research》2002,116(1-2)
Nisyros island, a Quaternary volcanic center located at the SE of the Aegean Volcanic Arc, has been in the past characterized by periods of intense seismic activity accompanied sometimes by hydrothermal explosions, the last one being in 1887. The recent long lasting episode of unrest (1995–1998) in the area is the first instrumentally documented providing information on the behavior of the volcano. Evidence from seismicity and SAR interferometry suggests that the presently active part of the Kos–Nisyros volcano-tectonic complex is located at the NW coast of Nisyros island defining an area much smaller than the whole volcano-tectonic area. Seismicity patterns vary both temporally and spatially consistently with different rates of vertical ground deformation inferred from SAR interferometry. These observations help us to discuss the different elements controlling the behavior of the volcanic system such as: the existence, location and timing of magma chamber inflation, the occurrence of tensile failure at the boundaries of the chamber and the possibility of magmatic fluids being expelled to form a shallow magmatic intrusion, the seismic failure and migration of hypocenters indicating shallow magma transport. 相似文献
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Z. Schenková V. Schenk I. Kalogeras R. Pichl P. Kottnauer C. Papatsimba G. Panopoulou 《Journal of Seismology》2007,11(3):345-353
Macroseismic intensity, a useful measure of earthquake effects, is still applied in a wide range of seismological applications
like seismic hazard assessments, attenuation relationships, etc. Isoseismals represent the spatial distribution of macroseismic
intensities, and their shapes depend on source properties, lithosphere structures, tectonic line orientations, site geology,
and topography. The applications ask for both the higher number of isoseismal maps, and their standardization and homogenization.
The point kriging gridding method for an automatic computer drawing of isoseismal maps was delivered. Smoothing rates and
numerical parameters used in the kriging algorithm were tested on macroseismic data of Greek earthquakes representing different
tectonic and geomorphological regimes. The optimum kriging default option was defined. Its application for four Greek earthquakes
is presented and discussed from the viewpoint of a broad use in recent macroseismology.
The online version of the original article can be found at . 相似文献
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Isoseismal maps drawing by the kriging method 总被引：1，自引：0，他引：1
Z. Schenková V. Schenk I. Kalogeras R. Pichl P. Kottnauer C. Papatsimba G. Panopoulou 《Journal of Seismology》2007,11(1):121-129
Macroseismic intensity, a useful measure of earthquake effects, is still applied in a wide range of seismological applications
like seismic hazard assessments, attenuation relationships, etc. Isoseismals represent the spatial distribution of macroseismic
intensities and their shapes depend on source properties, lithosphere structures, tectonic line orientations, site geology
and topography. The applications ask for both the higher number of isoseismal maps and their standardization and homogenization.
The point kriging gridding method for an automatic computer drawing of isoseismal maps was delivered. Smoothing rates and
numerical parameters used in the kriging algorithm were tested on macroseismic data of Greek earthquakes representing different
tectonic and geomorphological regimes. The optimum kriging default option was defined. Its application for four Greek earthquakes
is presented and discussed from viewpoint of a broad use in recent macroseismology.
An erratum to this article can be found at 相似文献
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A brief history of operation of the mechanicalseismographs in Greece and the application of atechnique for converting analog seismograms to digitaltraces in a form suitable for further processing orarchiving are presented in this study. A short historyabout the installation of mechanical seismographs inGreece, the characteristics of these instruments, areference on the usage of historical records, as wellas a presentation of the procedure followed from theidentification of the record to the archiving it as adigital file have been included. 相似文献
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The strong ground motion from Athens, Greece 07/09/1999 earthquake has been recorded by eighteen (18) stations, fourteen (14) within the central Athens area and four (4) at the centers of nearby towns. The ground conditions for most of the recording sites were identified, based on previous geotechnical investigations carried out in the wider area of the sites, and consequently correlated to the seismic motion characteristics. Hence, it has been possible to evaluate the accuracy of different seismological methods for site characterization and also estimate soil effects on peak ground acceleration and elastic response spectra. In addition, preliminary estimates are drawn for the seismic motion characteristics at the epicentral area, where no strong motion recordings are available. The detailed soil profiles at the recordingsites are placed in the Appendix. 相似文献
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Z. Roumelioti A. Kiratzi N. Theodoulidis I. Kalogeras G. Stavrakakis 《Pure and Applied Geophysics》2003,160(12):2301-2318
The empirical Green's functions technique is applied to simulate strong ground motion records from the September 7, 1999, Athens earthquake. Information on the fault parameters from previous independent studies has been used and several scenarios were examined, in regard to the location of the starting point of the rupture, by comparing the synthetic records with the corresponding observed ones, through a residual function and a correlation function. The results show that the rupture started at the deepest, 4–5 km, part of the fault from its western edge. This hypocenter was then used, in combination with the initial fault model, to stochastically simulate the strong ground motion during the Athens main shock, in terms of peak-ground acceleration at hard rock. The results show that directivity might have significantly contributed to the destructiveness of this earthquake at specific parts of the Athens Metropolitan area. 相似文献