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首页> 外文期刊>Earth, planets and space: EPS >Coseismic displacements and slip distribution from GPS and leveling observations for the 2006 Peinan earthquake (Mw 6.1) in southeastern Taiwan
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Coseismic displacements and slip distribution from GPS and leveling observations for the 2006 Peinan earthquake (Mw 6.1) in southeastern Taiwan

机译：GPS的同震位移和滑动分布以及2006年台湾东南部Peanan地震（Mw 6.1）的水准观测

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Since 2001, we have set up a dense geodetic network with 52 campaign-mode GPS sites and seven continuously recording GPS stations as well as six leveling routes in the Taitung area, Taiwan. Our aim was to better characterize near-fault crustal deformation of active faults at the plate suture of the Philippine Sea plate and Eurasia in southeastern Taiwan. On 1 April 2006, a moderate shallow earthquake (Mw 6.1, depth 10.8 km) occurred within this network. This earthquake resulted from rupturing of a geologically unknown or suspected fault (called the Y fault) located underneath the eastern margin of the Central Range. After removing the impacts of secular motions and postseismic slip, we estimated the coseismic displacements of the Peinan earthquake from the GPS and leveling measurements before and after the main shock. Three deformation types with distinct slip behaviors were revealed in three different regions: (1) near the epicenter—around 45 mm movement in the S-SSW direction with +20 to -20 mm vertical motion, in the northern part of the Y fau (2) south of the epicenter across the southern part of the Y fault—approximately 35 mm in a westward movement with -60 mm subsidence (footwall side) and 40 mm in a SSW movement with at least 50 mm uplift (hanging-wall side), in the southern part of the Y fau (3) northeast away from the epicenter—about 10 mm in a northward displacement with +15 to -10 mm vertical motions, in the Longitudinal Valley and on the western flank of the Coastal Range. This unique coseismic deformation pattern sheds new light on the characteristics of the suture zone between the Eurasian and Philippine Sea plates at the southernmost Longitudinal Valley. We used GPS and leveling measurements to invert for the fault geometry and the coseismic slip distribution. The optimal modeled fault is an 80° west-dipping fault at a depth of 0.5-20 km. The highest slip of about 0.33 m is located to the south of the hypocenter at a depth of 9-16 km. The total geodetic moment in our optimal model is 2.3 × 1018 Nt-m, which is equivalent to an earthquake of Mw 6.2. The surface coseismic displacements as well as the inferred coseismic slip distribution indicate a drastic change of slip behaviors in the middle of the Y fault. The left-lateral slippage near the hypocenter turned dramatically to reverse faulting with left-lateral component as rupturing propagated to the southern portion of the fault, suggesting that a possible right-lateral faulting occurred that coseismically cross cut the northern middle Peinanshan massif in the Longitudinal Valley.
机译：自2001年以来，我们在台湾台东地区建立了一个密集的大地测量网络，该网络具有52个运动模式GPS站点，七个连续记录的GPS站以及六个测平路线。我们的目的是更好地表征台湾东南部菲律宾海板和欧亚大陆板缝的活动断层的近断层地壳形变。 2006年4月1日，该网络内发生了中度浅层地震（Mw 6.1，深度10.8 km）。这次地震是由位于中央山脉东缘下方的未知地质断层或可疑断层（称为Y断层）破裂引起的。除去长期运动和地震后滑移的影响后，我们根据GPS和主震前后的水准测量值估算了Peanan地震的同震位移。在三个不同区域揭示了三种具有明显滑移行为的变形类型：（1）震中附近-Y断层北部沿S-SSW方向移动约45mm，垂直运动+20至-20mm。 （2）震中以南横跨Y断层的南部-向西运动约35毫米，下沉-60毫米（底盘侧），而南海运动约40毫米，至少有50 mm隆起（上壁侧） ），在Y断层的南部; （3）远离震中东北部-在纵向谷和沿海山脉的西侧，向北移动约10毫米，垂直运动+15至-10毫米。这种独特的同震变形模式为最南端的纵谷处的欧亚和菲律宾海板之间的缝合带特征提供了新的思路。我们使用GPS和水准测量来反转断层的几何形状和同震滑动分布。最佳的模拟断层是深度为0.5-20 km的80°西倾断层。大约0.33 m的最大滑移位于震中区的南部，深度为9-16 km。我们的最佳模型中的总大地矩为2.3×1018 Nt-m，相当于6.2兆瓦地震。地表同震位移以及推断的同震滑动分布表明，Y断层中部的滑动行为发生了剧烈变化。随着破裂扩展到断层的南部，震源附近的左旋滑动急剧地逆转了断层，并伴有左旋分量，这表明可能发生了右旋断层，同震横切了北纵断面北纵断面谷。

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