Surface Rupture and Slip Distribution along the Karadere Segment of the 17 August 1999 İzmit and the Western Section of the 12 November 1999 Düzce, Turkey, Earthquakes
Surface Rupture and Slip Distribution along the Karadere Segment of the 17 August 1999 İzmit and the Western Section of the 12 November 1999 Düzce, Turkey, Earthquakes
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1999年8月17日伊兹密特地震Karadere段和1999年11月12日土耳其迪兹杰地震西段沿地表破裂和滑移分布
DOI：
10.1785/0120000829
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发表时间：
2002
影响因子：
3
通讯作者：
E. Altunel
中科院分区：
文献类型：
--
作者：
Ross D. Hartleb;J. Dolan;H. Akyüz;T. Dawson;Allan Z. Tucker;Baris Yerli;T. Rockwell;E. Toraman;Z. Çakır;Aynur Dikbaş;E. Altunel
1999年8月17日，在土耳其兹米特发生的Mw7.5级地震造成的地表破裂超过120 km，可能多达200 km，并沿北安纳托利亚断层带的西部沿着发生高达5 m的右旋滑动。1999年11月12日，土耳其Duzce发生的Mw 7.1地震产生了一个40 km长的表面破裂，其中9 km的破裂与8月事件的东端重叠。我们的制图集中在40公里长的Karadere破裂段，8月事件的最东端，以及在西部的20公里的诺瓦雷破裂。沿Karadere段的最大右旋滑动沿着约为1.5 m，该段的平均滑动接近1 m。虽然沿Karadere段的滑动沿着比向西的段小得多，但这一段特别令人感兴趣，原因有三：（1）Karadere段的西部边界由沿整个Au-阵风表面破裂沿着的最显著的结构不连续性限定（即，一个5 km宽的无地表破裂区，以及从E-W向ENE的趋势变化25），这样的不连续性可能对破裂动力学有重要意义：（2）地表破裂终止于Eften湖1.5- 3 km宽的伸展阶跃处的Karadere破裂段的伦敦东区; 1999年11月12日Duzce地震使Karadere段最东端的9 km再次破裂，提出了有关破裂动力学和相邻断层段上事件之间相互作用的有趣问题。1999年8月17日和1999年11月12日的地表破裂痕迹的细节表明，破裂可能已经部分传播了整个Eften湖伸展步越，虽然这个步越似乎已经作为一个有效的屏障破裂传播。
On 17 August 1999 the Mw 7.5 I zmit, Turkey, earthquake produced surface rupture in excess of 120 km, and perhaps as much as 200 km, with up to 5 m of dextral slip, along a western portion of the North Anatolian fault zone. The 12 November 1999 Mw 7.1 Duzce, Turkey, earthquake produced a 40-km-long sur- face rupture, including 9 km of rupture overlap with the eastern end of the August event. Our mapping focused on the 40-km-long Karadere rupture segment, the east- ernmost segment of the August event, as well as on the western 20 km of the No- vember rupture. Maximum dextral slip along the Karadere segment is approximately 1.5 m, and the average slip on this segment is close to 1 m. Although slip along the Karadere segment is considerably less than that on segments to the west, this segment is of particular interest for three reasons: (1) the western boundary of the Karadere segment is defined by the most striking structural discontinuity along the entire Au- gust surface rupture (i.e., a 5-km-wide zone of no surface rupture, as well as a 25 change in trend from E-W to ENE), and such a discontinuity may have important implications for rupture dynamics; (2) surface rupture terminates at the east end of the Karadere rupture segment at a 1.5- to 3-km-wide extensional step-over at Eften Lake; and (3) the 12 November 1999 Duzce earthquake reruptured the easternmost 9 km of the Karadere segment, raising interesting questions about rupture dynamics and interactions between events on adjacent fault segments. The details of the 17 August 1999 and l2 November 1999 surface rupture traces suggest that rupture may have partially propagated across the Eften Lake extensional step-over, although this step-over seems to have acted as an effective barrier to rupture propagation.