Crustal Strains in the Eastern Mediterranean and Middle East as Derived from GPS Observations
スポンサーリンク
概要
- 論文の詳細を見る
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.
- 2000-12-22
論文 | ランダム
- 巻頭論文 留保金課税の今日的課題と方向性
- 増加する租税手続法上のトラブルへの対応--国税通則法の真の理解のために (特集 実務で目立つ租税手続上のトラブルとその原因分析)
- チタン製インプラント周囲の骨および微細血管構築の走査電子顕微鏡的観察
- 税務論文 資産の無償等譲渡をめぐる課税と徴収の交錯(5・最終回)
- 8 チタン製インプラント周囲の骨および微細血管構築の走査電子顕微鏡的研究 (第436回 大阪歯科学会例会)