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首页> 外文期刊>Journal of Asian earth sciences >Source characteristics and Coulomb stress change of the 19 May 2011 M_w 6.0 Simav-Kuetahya earthquake, Turkey
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Source characteristics and Coulomb stress change of the 19 May 2011 M_w 6.0 Simav-Kuetahya earthquake, Turkey

机译：2011年5月19日土耳其Simav-Kuetahya M_w 6.0地震的震源特征和库仑应力变化

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摘要

On 2011 May 19, Simav district of Kutahya province in northwest Anatolia was hit by a moderate size (M_w = 6.0) earthquake. Centroid moment tensors for 41 events with moment magnitudes (M_w) between 3.5 and 6.0 are computed by applying a waveform inversion method on data from the Kandilli Observatory and Earthquake Research Institute broadband seismic network. The time span of data covers the period between 2011 May 19 and 2011 August 22. The mainshock is a shallow focus normal event at a depth of 10 km. Focal depths of aftershocks range from 5 to 20 km. The seismic moment (M_o) of the mainshock is calculated 1.15 × 10~(18) Nm. The estimated rupture duration of the Simav mainshock is 30 s. The focal mechanisms of the aftershocks are mainly normal faulting with a variable strike-slip component. The geometry of focal mechanisms reveals a normal faulting regime with NE-SW trending direction of T-axis in the entire activated region. A stress tensor inversion of focal mechanism data is performed to acquire a more accurate picture of the Simav earthquake stress field. The stress tensor inversion results indicate a predominant normal stress regime with a NW-SE oriented maximum principal compressive stress (σ_1,). According to high-resolution hypocenter relocation of the Simav seismic sequence, two main clusters are revealed. The aftershock activity in the observation period between 2011 May 19 and 2011 August 22 extends from the mainshock cluster to the NE direction. Seismic cross-sections indicate that a complex pattern of the hypocenter distribution with the activation of two nearly parallel faults. The northern cluster is associated with a fault plane trending mainly E-W and dipping towards SE, while the southern is related to a fault plane trending NW-SE and dipping towards SE. The best constrained focal depths indicate that the aftershock sequence is mainly confined in the crust (depth ＜ 25 km) and is operating in the approximate depth range from 2 to 24 km. Consequently, Coulomb stress analysis is performed to calculate the stress transfer and correlate it with the activated region. Positive lobes with stress more than 3 bars are obtained, indicating that these values are large enough to increase the Coulomb stress failure towards NW-SE direction.
机译：2011年5月19日，安纳托利亚西北部库塔希亚省Simav区遭受中度（M_w = 6.0）中等地震袭击。通过对坎迪里天文台和地震研究所宽带地震网络的数据应用波形反演方法，计算出矩量（M_w）在3.5和6.0之间的41个事件的质心矩张量。数据的时间跨度涵盖2011年5月19日至2011年8月22日之间。主震是深度为10 km的浅焦点正常事件。余震的震源深度为5至20 km。计算得出主震的地震矩（M_o）为1.15×10〜（18）Nm。 Simav主震的估计破裂持续时间为30 s。余震的震源机制主要是正断层，走滑分量可变。震源机制的几何特征揭示了一个正常的断层状态，在整个激活区域内，Ｔ轴呈ＮＥ－ＳＷ趋势。执行震源机制数据的应力张量反演，以获取Simav地震应力场的更准确的图片。应力张量反演结果表明，以NW-SE定向的最大主压应力（σ_1，）为主导的正应力状态。根据Simav地震序列的高分辨率震源重定位，揭示了两个主要的星团。 2011年5月19日至2011年8月22日的观测期余震活动从主震团向NE向延伸。地震剖面表明，震源分布的复杂模式是由两个几乎平行的断层引起的。北部的群与断层平面有关，主要是E-W向SE倾斜，而南部的群与断层平面具有NW-SE向SE倾斜。最佳约束震源深度表明，余震序列主要局限于地壳（深度＜25 km），并且在大约2至24 km的深度范围内运行。因此，执行库仑应力分析以计算应力传递并将其与激活区域相关联。获得了应力大于3 bar的正凸角，表明这些值足够大，可以增加向NW-SE方向的库仑应力破坏。

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