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2012年10月28日海达瓜伊M_W7.8地震是沿加拿大不列颠哥伦比省大倾斜汇聚的夏洛特皇后边缘的大型逆冲区地震。由于在250km的破裂区域内只有6个全球定位系统(GPS)测点和2个检潮仪台站,大地测量没有很好约束同震变形。为了更好地约束垂直同震变形,我们测量了相对于震后5个月、25个测点海平面由自然条件控制的两个固着潮间带生物的生长上限。测量了岩藻(双列藻属,617个测点)和常见的橡子藤壶(藤壶属,686个测点)的位置。本研究重点探讨了该群岛的西侧,破裂模型表明有大规模垂直位移,同时也调查了远离推断破裂区的场点,以对照不受垂直位移影响的生物的上限。同时还做了322次海平面测量,以使用TPXO7.2潮汐模型,而不是使用全球定位系统确定的椭圆高度将生长极限与潮汐基准面相关联。用3种方法检查该数据都表明莫尔兹比岛西海岸由于2012年10月28日的海达瓜伊地震而出现了0.4~0.6m的沉降。我们的数据,在误差范围内,与海达瓜伊西海岸两个全球定位系统测点的数据一致,且与该群岛近海而非之下的大型逆冲破裂的破裂模型一致。
October 28, 2012 The Dahawuguiya M_W7.8 earthquake is a large thrust earthquake that enveloped the edge of the Queen Charlotte, along a large tilt in British Columbia, Canada. Due to only 6 Global Positioning System (GPS) measuring points and 2 tide gauge stations within a 250 km rupture zone, geodesy does not properly constrain coseismic deformation. In order to better constrain the vertical coseismic deformation, we measured the upper limit of growth of two anchored intertidal organisms controlled by natural conditions at sea level of 25 test sites relative to 5 months after the earthquake. The locations of the dracaena (Diptera, 617 test spots) and the common acorn barnacle (barnacle, 686 test points) were measured. This study focuses on the west side of the archipelago. The rupture model shows large-scale vertical displacements. Field points away from extrapolated rupture areas are also investigated to compare the upper bounds of organisms that are not affected by vertical displacements. 322 sea level measurements were also made at the same time to use the TPXO 7.2 tide model rather than using the global elliptical height determined by the Global Positioning System to relate the growth limit to the tidal datum. Examination of this data by 3 methods shows that a 0.4-0.6 m settlement occurred on the west coast of Port Moresby due to the Hadakui earthquake on October 28, 2012. Our data are within error bounds consistent with data from the two GPS measurements on the western coast of Haiti, and are consistent with the large-scale rupture rupture model near the sea off the islands.