Azimuthal anisotropy and attenuation structures of the Anatolian Plate

安纳托利亚板块受到其周围板块之间复杂的构造相互作用的显著影响。研究安纳托利亚板块的地下结构将提供大陆碰撞和俯冲如何改变岩石圈及其下面的软流圈的快照。此外，这些构造板块之间的相互作用使土耳其成为世界上地震最活跃的地区之一。有几个大型断裂带，包括1500公里长的北安纳托利亚断层，这些断裂带引发了大震级地震，对当地社区造成了严重破坏。在这个项目中，PI建议绘制安纳托利亚板块的地震结构图，这使研究人员能够检验几个科学假说，如北安纳托利亚断裂带的行为和火山田的岩浆室。有了新的地震模型，研究小组将模拟与土耳其可能发生的一些大震级地震相关的地面运动。这些预测将为地震灾害评估和减灾提供有价值的信息，这将产生重大的社会和经济影响。该项目将通过支持一名早期职业PI和一名博士研究生来推动德克萨斯大学达拉斯分校一个新的地球物理学小组的发展。该项目的成果将通过同行评议的出版物、在国家会议上的陈述以及在线层析模型可视化平台传播。在该项目的支持下，PI的团队将开发一种新的安纳托利亚板块层析模型，其中包括地震速度、方位各向异性和剪切衰减的三维变化。全波形反演是一种先进的成像技术，它考虑了复杂的波动物理，将被用来更好地提取地球物质的定量信息。通过联合解释速度和方位各向异性，该团队将检验以下问题：(1)北安纳托利亚断裂带是岩石圈还是地壳尺度转换断层？(2)安纳托利亚板块下方是否存在下地壳通道流？(3)地幔流动对安纳托利亚板块向西挤压和逆时针旋转有何响应？此外，考虑到衰减和速度对地壳和地幔物质物理状态的不同敏感性，联合解释这些结果将有助于更好地圈定岩浆房的形态，并探测中、东部安纳托利亚火山场下潜在的部分熔融。检验这些科学假设将提高我们对大陆碰撞和俯冲如何改变安纳托利亚岩石圈和软流圈的了解。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

The Anatolian Plate has been significantly modified by complex tectonic interactions among its surrounding plates. Studying the subsurface structures of the Anatolian Plate will provide a snapshot about how continental collision and subduction modify the lithosphere and its underlying asthenosphere. In addition, the interactions among these tectonic plates make Turkey one of the most seismically active regions in the world. There are several large fault zones, including the 1500 km North Anatolian Fault, which have generated large magnitude earthquakes and serious damage to the local community. In this project, the PI proposes to map seismic structures of the Anatolian Plate, which enable the investigators to test several scientific hypotheses, such as the behaviors of the North Anatolian Fault Zone and the magma chamber of volcanic fields. With the new seismic model, the team will simulate ground motions associated with a number of large magnitude earthquakes that may occur in Turkey. These predictions will provide valuable information for seismic hazard evaluation and mitigation, which will have significant social and economic impacts. This project will advance the development of a new geophysics group at UT Dallas by supporting an early career PI and one Ph.D. graduate student. Results from this project will be disseminated via peer-reviewed publications, presentations at national meetings, as well as an online tomographic model visualization platform.With the support of this project, the PI's team will develop a new tomographic model for the Anatolian Plate, which includes 3-D variations in seismic velocities, azimuthal anisotropy and shear attenuation. Full waveform inversion, an advanced imaging technology which takes complicated wave physics into account, will be used to better extract quantitative information for the Earth's materials. By jointly interpreting velocities and azimuthal anisotropy, the team will test the following the following questions: (1) Is the North Anatolian Fault Zone a lithospheric or crustal scale transform fault? (2) Are there lower crust channel flows underneath the Anatolian Plate? (3) How do the mantle flows respond to the westward extrusion and counterclockwise rotation of the Anatolian Plate? Furthermore, considering different sensitivities of attenuation and velocity to the physical states of the crustal and mantle materials, joint interpretation of these results will help to better delineate the morphology of magma chambers, and detect potential partial melt underneath the Central and Eastern Anatolian Volcanic Fields. Testing these scientific hypotheses will improve our knowledge on how continental collision and subduction modify the Anatolian lithosphere and asthenosphere.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.