Microtremor exploration for shallow S-wave velocity profiles at stations in local strong motion network in Bursa, Yalova, and Kocaeli in north-western Turkey
| Autor: | Kudret Tekin, Mehmet Akif Alkan, Ulubey Çeken, Kosuke Chimoto, Hiroaki Yamanaka, Erkan Ateş, Özgür Tuna Özmen |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Exploration Geophysics. 48:255-263 |
| ISSN: | 1834-7533 0812-3985 |
| DOI: | 10.1071/eg16036 |
| Popis: | We conducted microtremor array surveys for shallow S-wave velocity profiles at 20 sites in Bursa, Yalova and Kocaeli provinces in the north-western part of Turkey to provide fundamental data to assess the seismic hazard in the area. All of the measurement sites were positioned very close to strong motion stations belonging to the Disaster and Emergency Management Presidency of Turkey (AFAD) in order to further understand site amplification factors in strong motion records. Of the 20 study sites, two were located in Yalova, four in Bursa and 14 in Kocaeli. We temporarily installed two small arrays to obtain simultaneous records of vertical microtremors. Then, the spatial autocorrelation method was applied to retrieve Rayleigh wave phase velocity curves in a frequency range from 1 to 30 Hz from the array records. The phase velocities in the western part of the Kocaeli area are low across a wide frequency range, while relatively high phase velocities are found in the eastern part of the Kocaeli province. The... |
| Databáze: | OpenAIRE |
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