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GROUND TRUTH DATA IN INDIA AND CHINA FROM DENSE LOCAL NETWORKS AND CALIBRATION EXPERIMENTS

Obtaining and interpreting qualified, regional geologic and geophysical data from countries such as India and China has been an important scientific and technical goal for many years. To aid in this effort, the U.S. Geological Survey has been building relationships with comparable government organizations throughout Asia. Here we present preliminary results from this interaction in the form of ground truth and crustal structure information for India and China. We have successfully developed a cooperative program with Indian scientists over the past several years. During that time, delegations from Indian geophysical laboratories have made multiple visits to Menlo Park, CA, bringing with them new seismic data and crustal structure information. We have been very pleased to achieve such unprecedented access to data and their interpretation. During the most recent visit, shallow seismic refraction data from NE India (Kutch region), near the epicenter of the 2001 Bhuj earthquake and in close proximity to the Indian nuclear test site, were processed and interpreted. Another highlight of this cooperation has been the release of aftershock data. This data has relocated hypocenters determined from 18 local seismic stations and were obtained during a visit to India. We continue our ongoing program of collecting crustal structure and ground truth information from China as well. This effort has likewise been a great success as delegations from many organizations within China have shared data and offered cooperation over the years. We are currently reprocessing data from a 1000-km-long seismic refraction profile centered at 36° N and 104° E. There are 9 borehole chemical shots on this profile, each with 3000-4000 kg charges. The resulting P-wave and S-wave arrivals are excellent. The large borehole explosions will likely have been recorded at seismic monitoring sites, and will serve as valuable ground truth events. In addition, we are working with Chinese seismic network catalog data that provide excellent ground truth seismic events. 24th Seismic Research Review – Nuclear Explosion Monitoring: Innovation and Integration