A high-resolution, integrated study of seismic structures and risks

地球是一个复杂的动力系统。 虽然它的基本特征通常符合简单的板块构造理论，但地壳/地幔岩石的详细弹性特性和地震的起源因地区而异。 充分的数据覆盖面和对地震活动性、地下速度、分层和应力条件的更好了解是准确评估板块历史和状态的先决条件。 拟议的研究计划将针对这两个问题的基础上，多尺度，综合研究。 拟议方案的两个关键组成部分是：（1）量化加拿大西部下方的区域地震结构和风险，（2）提高全球地壳和地幔地震图像的质量，重点是俯冲带、洋脊和热点。拟议计划的第一个组成部分将把联合收割机被动震源部署与基于实验室的地震风险、速度和各向异性分析结合起来。 它将通过编制准确的区域微震活动目录和三维地震速度图，扩大加拿大落基山脉和阿尔伯塔网络的成功，该网络是阿尔伯塔的第一个宽带地震阵列。 预期的研究成果，特别是那些与当地微震的起源和分布有关的研究成果，可能会直接影响环境政策/决定，这对阿尔伯塔省的持续经济增长至关重要。 这项建议的第二个组成部分将是对现有地震网络的地震数据进行基于实验室的全球分析。 宽带数据和新的阵列成像方法的可用性将使各种构造体制下的地壳和地幔的高分辨率快照成为可能。 拟议研究计划的两个组成部分在规模和范围上是互补的。 它们共同构成了板块历史和地震风险长期研究的坚实基础。 拟议的计划将是几个研究生的研究和培训的一个组成部分。 它还将为本科生提供夏季研究机会，并为其他高素质人员提供培训。

The Earth is a complex dynamic system. While its fundamental characteristics generally subscribe to the simple theory of plate tectonics, the detailed elastic properties of crust/mantle rocks and the origins of earthquakes differ from region to region. Sufficient data coverage and improved knowledge of seismicity, subsurface velocity, stratification and stress condition are prerequisites for an accurate assessment of plate histories and states. The proposed research program will target both issues based on a multi-scale, integrated study. The two key components of the proposed program are: (1) to quantify the regional seismic structures and risks beneath western Canada, and (2) to improve the quality of global crust and mantle seismic images, emphasizing subduction zones, ridges and hotspots. The first element of the proposed program will combine passive-source deployments of broadband seismometers with laboratory-based analyses of seismic risk, velocity and anisotropy. It will expand the success of the Canadian Rockies and Alberta Network (CRANE), the first broadband seismic array in Alberta, by compiling accurate regional catalogues of microseismic activity and maps of three-dimensional seismic velocity. Expected research outcomes, especially those pertaining to the origin and distribution of local microseisms, could directly impact the environmental policies/decisions that are vital for the sustained economic growth in the province of Alberta. The second component of this proposal will be a laboratory-based, global analysis of earthquake data from existing seismic networks. The availability of broadband data and novel array-based imaging methods will enable high-resolution snapshots of the crust and mantle beneath various tectonic regimes. The two components of the proposed research program are complementary in scale and scope. Together, they form a solid foundation for long-term studies of plate history and seismic risk. The proposed program will be an integral part of the research and training of several graduate students. It will also present summer research opportunities for undergraduate students, as well as training for other highly qualified personnel.