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首页> 外文期刊>Earth, planets and space: EPS >Propagation of the 2001-2002 silent earthquake and interplate coupling in the Oaxaca subduction zone, Mexico
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Propagation of the 2001-2002 silent earthquake and interplate coupling in the Oaxaca subduction zone, Mexico

机译：墨西哥瓦哈卡俯冲带2001-2002年无声地震和板间耦合的传播

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The aseismic slow slip event of 2001-2002 in Guerrero, Mexico, with an equivalent magnitude MW ~ 7.5, is the largest silent earthquake (SQ) among many recently recorded by GPS in different subduction zones (i.e. Japan, Alaska, Cascadia, New Zealand). The sub-horizontal and shallow plate interface in Central Mexico is responsible for specific conditions for the ~100 km long extended transient zone where the SQs develop from ~80 to ~190 km inland from the trench. This wide transient zone and relatively large slow slips of 10 to 20 cm displacements on the subduction fault result in noticeable surface displacements of 5-6 cm during the SQs. Continuous GPS stations allow one to trace the propagation of SQs, and to estimate their arrival time, duration and geometric attenuation. These propagation parameters must be accounted in order to locate source of slow slips events and to understand the triggering effect that they have on large subduction earthquakes. We use longbaseline tiltmeter data to define new time limits (onset and duration) for the SQs and continuous records from 8 GPS stations to determine the propagation of the 2001-2002 SQ in Central Mexico. Data from the CAYA and IGUA GPS stations, separated by ~170 km and located along the profile perpendicular to the trench, are used to determine that the surface deformation from the 2001-2002 SQ started almost instantaneously. It propagated parallel to the coast at ~2 km/day with an exponential attenuation of the horizontal surface displacement and a linear decrease of its duration with distance. Campaign data obtained yearly from 2001 to 2005 at the Oaxaca GPS network have been modeled according to a propagation of the 2001-2002 SQ step-like displacement anomaly. This modeling shows that the SQ ceased gradually in the central part of the Oaxaca segment of the subduction zone (west of Puerto Angel, PUAN) and then it apparently triggered another SQ in SE Oaxaca (between PUAN and Salina Cruz, SACR). The estimated horizontal velocities for inter-event epochs at each GPS site are used to assess an average interplate coupling in the Central Oaxaca subduction zone.
机译：GPS最近记录的不同俯冲带中最大的无声地震（SQ）是墨西哥格雷罗2001-2002年的地震慢滑事件，等效震级M W 〜7.5。日本，阿拉斯加，卡斯卡迪亚，新西兰）。墨西哥中部的亚水平和浅板界面负责约100 km长的扩展过渡带的特殊条件，在该过渡带中，SQs从海沟向内陆延伸约80至190 km。俯冲断层上较宽的过渡带和相对较大的缓慢滑动（10到20 cm位移）导致在SQ期间出现5-6 cm的明显表面位移。连续的GPS站可以跟踪SQ的传播，并估计其到达时间，持续时间和几何衰减。必须考虑这些传播参数，以便找到慢滑事件的来源并了解它们对大俯冲地震的触发作用。我们使用长基线测斜仪数据来定义SQ的新时间限制（开始时间和持续时间），以及来自8个GPS站的连续记录，以确定2001-2002 SQ在墨西哥中部的传播。来自CAYA和IGUA GPS站的数据（相距约170 km，并沿着垂直于沟槽的剖面定位）用于确定2001-2002 SQ的表面变形几乎是瞬时开始的。它以〜2 km / day的速度平行于海岸传播，水平面位移呈指数衰减，持续时间随距离呈线性下降。根据2001-2002 SQ阶梯状位移异常的传播，对2001年至2005年在瓦哈卡GPS网络上每年获取的战役数据进行了建模。该模型表明，SQ在俯冲带瓦哈卡段的中部（PUAN，Puerto Angel以西）逐渐停止，然后显然触发了SE Oaxaca的另一个SQ（PUAN和SARINA Cruz之间）。每个GPS地点事件间历元的估计水平速度用于评估瓦哈卡中央俯冲带中板块间的平均耦合。

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