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We will explore the cause of earthquakes in North China using the following approach:
We will create a three-dimensional model of the entire North China lithosphere using ambient seismic noise. This new technique is able to image earth structure in much higher resolution than conventional methods. We will combine this method with body wave data to further refine the lithospheric structure of the North China plain that will allow spatial correlation of seismicity with active fault zones and specific lithospheric structures. To explore the control of earthquake clustering in the Shanxi rift and apparent earthquake migration to the North China Plain, we will jointly invert active-source (man made) and passive-source (earthquake) data to produce high-resolution models of the Shanxi rift and the Tangshan fault zones.
We will use Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (InSAR) to study present-day crustal motion and deformation in North China. We will use the existing GPS data from the Chinese GPS network, and work with Chinese colleagues to deploy local GPS networks across the northern Shanxi rift and the Tangshan fault zone. InSAR complements GPS by providing area mapping of surface deformation. Because the anticipated deformation rates are small, we plan to use Interferometric Point Target Analysis (IPTA) to improve the results.
We will reconstruct Holocene earthquake history through excavation of trenches along the northern Shanxi Rift and the Tangshan fault, and determine long-term slip rates (over thousands to tens of thousands of years) by detailed mapping and measurement of faulted landforms in the vicinity of the Shanxi and Tangshan fault zones. The southern part of the Tangshan fault zone extends into the Bohai Bay, providing an ideal site for underwater paleoseismic studies. We will use a high resolution seismic profiler ("chirp") to image cumulative vertical slip and horizontal offsets of marine sediments and paleo-stream channels by earthquake-related faulting events.
We will integrate the results of earth structure and crustal deformation in a suite of geodynamic models to explore the cause of earthquakes in North China and the controlling factors for their spatiotemporal clustering and migration.
|MU PIRE | Department of Geological Sciences | College of Arts and Science | University of Missouri-Columbia
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Last modified: 20-Jan-2015