Site-specific issues for strong ground motions during the Kocaeli, Turkey, earthquake of 17 August 1999, as inferred from array observations of microtremors and aftershocks

Kazuyoshi Kudo, Tatsuo Kanno, Hiroshi Okada, Oguz Özel, Mustafa Erdik, Tsutomu Sasatani, Sadanori Higashi, Masayoshi Takahashi, Kunikazu Yoshida

研究成果: ジャーナルへの寄稿記事

83 引用 (Scopus)

抄録

Array observations of microtremors and aftershocks were carried out near the permanent strong-motion observation sites and the damaged areas, after the Kocaeli, Turkey, earthquake of 17 August 1999. The major objectives were to determine S-wave velocity structures at the sites and to understand the site effects on strong motion or damage. Array observation of microtremors is a useful method for determining the S-wave velocity structures in a sedimentary basin, with less practical restriction than the other geotechnical methods. The spatial autocorrelation method (SPAC) was applied to array data of microtremors for determining S-wave velocity structures. The SPAC method generally provides an equivalent result with that of the frequency-wavenumber method, using fewer array sites and a smaller array size. Most strong-motion sites near the fault are classified into stiff and/or very hard soils. The records cannot directly be used for interpreting damage to buildings in the sedimentary basin. Records of long durations of strong motion at ATS, near Avcilar, west of Istanbul, are closely related to the low velocity (Vs ~ 200 m/sec) of the surface layers. The S-wave velocity structure at Avcilar, where there was severe damage during the mainshock, is similar to that of the lowland (ATS), and it differs significantly from that of CNA, located 4 km northeast of Avcilar, where the strong-motion record was obtained from the mainshock. The strong ground motion at Avcilar during the mainshock is estimated to be similar to that at ATS. Of the strong-motion sites, Sakarya (SKR) is located on very hard soil, whereas thick and soft sediments cover downtown Adapazari. It is plausible that strong ground motions during the mainshock in the damaged area, ADC, were significantly different from those of SKR. A large difference between the strong motions of a hillside and the Izmit Bay area in and around Golcuk is also indicated by a comparison of aftershock records.

元の言語英語
ページ(範囲)448-465
ページ数18
ジャーナルBulletin of the Seismological Society of America
92
発行部数1
DOI
出版物ステータス出版済み - 2 1 2002
外部発表Yes

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microtremor
Turkey
strong motion
aftershock
ground motion
Earthquakes
earthquakes
earthquake
velocity structure
ATS
wave velocity
S-wave
hard soil
S waves
Autocorrelation
sedimentary basin
autocorrelation
Soils
damage
soils

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

これを引用

Site-specific issues for strong ground motions during the Kocaeli, Turkey, earthquake of 17 August 1999, as inferred from array observations of microtremors and aftershocks. / Kudo, Kazuyoshi; Kanno, Tatsuo; Okada, Hiroshi; Özel, Oguz; Erdik, Mustafa; Sasatani, Tsutomu; Higashi, Sadanori; Takahashi, Masayoshi; Yoshida, Kunikazu.

:: Bulletin of the Seismological Society of America, 巻 92, 番号 1, 01.02.2002, p. 448-465.

研究成果: ジャーナルへの寄稿記事

Kudo, Kazuyoshi ; Kanno, Tatsuo ; Okada, Hiroshi ; Özel, Oguz ; Erdik, Mustafa ; Sasatani, Tsutomu ; Higashi, Sadanori ; Takahashi, Masayoshi ; Yoshida, Kunikazu. / Site-specific issues for strong ground motions during the Kocaeli, Turkey, earthquake of 17 August 1999, as inferred from array observations of microtremors and aftershocks. :: Bulletin of the Seismological Society of America. 2002 ; 巻 92, 番号 1. pp. 448-465.
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abstract = "Array observations of microtremors and aftershocks were carried out near the permanent strong-motion observation sites and the damaged areas, after the Kocaeli, Turkey, earthquake of 17 August 1999. The major objectives were to determine S-wave velocity structures at the sites and to understand the site effects on strong motion or damage. Array observation of microtremors is a useful method for determining the S-wave velocity structures in a sedimentary basin, with less practical restriction than the other geotechnical methods. The spatial autocorrelation method (SPAC) was applied to array data of microtremors for determining S-wave velocity structures. The SPAC method generally provides an equivalent result with that of the frequency-wavenumber method, using fewer array sites and a smaller array size. Most strong-motion sites near the fault are classified into stiff and/or very hard soils. The records cannot directly be used for interpreting damage to buildings in the sedimentary basin. Records of long durations of strong motion at ATS, near Avcilar, west of Istanbul, are closely related to the low velocity (Vs ~ 200 m/sec) of the surface layers. The S-wave velocity structure at Avcilar, where there was severe damage during the mainshock, is similar to that of the lowland (ATS), and it differs significantly from that of CNA, located 4 km northeast of Avcilar, where the strong-motion record was obtained from the mainshock. The strong ground motion at Avcilar during the mainshock is estimated to be similar to that at ATS. Of the strong-motion sites, Sakarya (SKR) is located on very hard soil, whereas thick and soft sediments cover downtown Adapazari. It is plausible that strong ground motions during the mainshock in the damaged area, ADC, were significantly different from those of SKR. A large difference between the strong motions of a hillside and the Izmit Bay area in and around Golcuk is also indicated by a comparison of aftershock records.",
author = "Kazuyoshi Kudo and Tatsuo Kanno and Hiroshi Okada and Oguz {\"O}zel and Mustafa Erdik and Tsutomu Sasatani and Sadanori Higashi and Masayoshi Takahashi and Kunikazu Yoshida",
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AU - Kudo, Kazuyoshi

AU - Kanno, Tatsuo

AU - Okada, Hiroshi

AU - Özel, Oguz

AU - Erdik, Mustafa

AU - Sasatani, Tsutomu

AU - Higashi, Sadanori

AU - Takahashi, Masayoshi

AU - Yoshida, Kunikazu

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