Seismotectonics of the southern boundary of Anatolia, eastern Mediterranean region: Subduction, collision, and arc jumping
Seismotectonics of the southern boundary of Anatolia, eastern Mediterranean region: Subduction, collision, and arc jumping
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东地中海地区安纳托利亚南部边界的地震构造：俯冲、碰撞和跳弧
DOI：
10.1029/jb087ib09p07694
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发表时间：
1982
影响因子：
--
通讯作者：
A. Kafka
中科院分区：
文献类型：
--
作者：
Y. Rotstein;A. Kafka
地震活动性和地震断层面的解决方案的模式被用来概述在地中海东部和土耳其东南部的安纳托利亚南部边界的构造特征。本研究的结果表明，该边界由两个不同的部分组成。一个是土耳其东南部和叙利亚，是一个广阔而复杂的大陆碰撞区。另一个位于地中海东部的黎凡特盆地，是一个大洋俯冲带。在大陆碰撞区，观察到三个地震活动带。这一地区的大部分地震活动都与Bitlis带有关，并与逆冲断层和造山带有关。这似乎是阿拉伯和土耳其之间的板块边界地区最活跃的变形和板块消耗区。Bitlis带以北的地震活动不太活跃的区域被解释为过去更活跃，而南部的另一个地震活动活跃的区域被解释为未来可能更活跃的区域，因为板块消耗的主要区域向南跳跃。在东地中海的俯冲带，俯冲板片的深度和地震活动率一般从东向西增加。地中海海脊的北方边缘可以最好地勾勒出地中海东部盆地中非洲和土耳其之间的现今汇合带。随着小的大陆碎片与现有的俯冲带碰撞，该地区的俯冲带依次向南跳跃。安塔利亚湾附近的深层地震活动与阿那克西曼德山脉北部的分离俯冲板片有关，这与现今活动俯冲的地震趋势明显不同。非洲和土耳其之间的板块边界在地中海东部盆地的中心似乎已经转移到南部的阿那克西曼德山脉和佛罗伦萨上升。沿整个安纳托利亚南部边界沿着地震的震源机制大多数表明，北向至北北西向逆冲是地震变形的主要方式。目前的一组数据是不一致的一个主要的转换断层在塞浦路斯东部和土耳其东南部的塞浦路斯弧。
The pattern of seismicity and fault plane solutions of earthquakes are used to outline the tectonic features of the southern boundary of Anatolia in the eastern Mediterranean and southeastern Turkey. The results of this study show that this boundary is composed of two distinct parts. One, in southeastern Turkey and Syria, is a wide and complex zone of continental collision. The other, in the Levantine basin of the eastern Mediterranean, is a zone of oceanic subduction. In the region of continental collision three zones of seismicity are observed. Most of the seismic activity in this region follows the Bitlis zone and is associated with a zone of thrusting and mountain building. This appears to be the zone of most active deformation and plate consumption in the plate boundary region between Arabia and Turkey. A less active zone of seismicity to the north of the Bitlis zone is interpreted to have been more active in the past whereas another active zone of seismicity to the south is interpreted to be a zone which may be more active in the future as the main zone of plate consumption jumps to the south. In the subduction zone of the eastern Mediterranean the depth of the subducted slab and the rate of seismicity generally increase from east to west. The zone of present-day convergence between Africa and Turkey in the Levantine basin can be best outlined by the northern edge of the Mediterranean ridge. The subduction zone in this area sequentially jumps to the south as small continental fragments collide with existing zones of subduction. Deep seismic activity near the Gulf of Antalya is associated with a detached subducted slab north of the Anaximander Mountains that is distinctly different from the seismic trend which is associated with present-day active subduction. The plate boundary between Africa and Turkey at the center of the Levantine basin appears to have shifted to the south of the Anaximander Mountains and Florence rise. Most of the focal mechanisms of the earthquakes along the entire southern boundary of Anatolia indicate that N to NNW thrusting is the dominant mode of seismic deformation. The present set of data is inconsistent with a major transform fault in the Cyprean arc east of Cyprus and in southeastern Turkey.