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Nine years of data from 1988 to 1997, estimated by McCLUSKY et al. (2000) were used to derive principal components of strains. We employed the Least-Squares Prediction (LSP) technique to segregate signals and noise in the data. Estimated signals were used to reconstruct the strains; dilatations, maximum shear strains, and principal axes of strains. Results of crustal strains clearly portray active tectonic strains in the study region. There are large convergent strain rates in the Mediterranean Sea, along the Hellenic Arc and south of it, which are directly related to the subduction of the African plate along this arc. Large extension strain rates with orientations varying between NNE-SSW and N-S are found in northern Aegean Sea and northwestern Anatolia. The southern Aegean Sea is characterized by relatively small strain rates. Convergent strain rate is dominant in the northeastern Africa, but occurs at a relatively low rate. 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Crustal Strains in the Eastern Mediterranean and Middle East as Derived from GPS Observations
https://doi.org/10.15083/0000032643
https://doi.org/10.15083/000003264381766ace-97ea-43fb-b314-f9826e0d9077
名前 / ファイル | ライセンス | アクション |
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ji0752001.pdf (2.2 MB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2008-05-30 | |||||
タイトル | ||||||
タイトル | Crustal Strains in the Eastern Mediterranean and Middle East as Derived from GPS Observations | |||||
言語 | en | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題 | GPS data | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | Crustal strain | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | Eastern Mediterranean | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | Least-Squares Prediction | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | Plate motion | |||||
主題Scheme | Other | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15083/0000032643 | |||||
ID登録タイプ | JaLC | |||||
その他のタイトル | ||||||
その他のタイトル | GPS観測から求めた東地中海および中東地域の地殻歪 | |||||
著者 |
El-fiky, Gamal S.
× El-fiky, Gamal S. |
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著者別名 | ||||||
識別子 | 126509 | |||||
識別子Scheme | WEKO | |||||
姓名 | エルフィキ, ガマル S. | |||||
著者所属 | ||||||
著者所属 | National Research Institute of Astronomy and Geophysics, Helwan | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Velocity vectors estimated by GPS observations in the Eastern Mediterranean and Middle East region were used to investigate the crustal strain distribution in this region. Nine years of data from 1988 to 1997, estimated by McCLUSKY et al. (2000) were used to derive principal components of strains. We employed the Least-Squares Prediction (LSP) technique to segregate signals and noise in the data. Estimated signals were used to reconstruct the strains; dilatations, maximum shear strains, and principal axes of strains. Results of crustal strains clearly portray active tectonic strains in the study region. There are large convergent strain rates in the Mediterranean Sea, along the Hellenic Arc and south of it, which are directly related to the subduction of the African plate along this arc. Large extension strain rates with orientations varying between NNE-SSW and N-S are found in northern Aegean Sea and northwestern Anatolia. The southern Aegean Sea is characterized by relatively small strain rates. Convergent strain rate is dominant in the northeastern Africa, but occurs at a relatively low rate. Patterns of strain rates located north and south of the Bitlis suture are quite similar, suggesting that most of the motion of Arabia is being transferred directly to Anatolia. East of the Karliova triple junction (KTJ), the compressional axes of strains show a tendency of being more easterly toward the NNE, resulting in shortening normal to the Caucasus thrust front. There is no indication of active deformation (almost strain-free) along the Cyprean Arc, south of Turkey, and near the Gulf of Iskenderum. Strain rates and level of earthquake occurrence are low in the central part of Anatolia, indicating that internal deformation in this region is very small. The principal axes of GPS strain rates show remarkable agreement with seismic data and fault plane solutions. In general, distinct seismic clusters accompany the areas of high geodetic strain rates, whereas the strain-free regions are nearly aseismic. | |||||
書誌情報 |
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 巻 75, 号 2, p. 105-125, 発行日 2000-12-22 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00408972 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00162258 | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
日本十進分類法 | ||||||
主題 | 453 | |||||
主題Scheme | NDC | |||||
出版者 | ||||||
出版者 | 東京大学地震研究所 | |||||
出版者別名 | ||||||
Earthquake Research Institute, University of Tokyo |