Terrorist attacks on the Murrah Federal Building in Oklahoma City, the World Trade Center in New York City, and the Pentagon in Washington, D.C. point to a need for the real-time monitoring and characterization of surficial detonations, particularly along lifelines in sparsely populated areas. To help evaluate the feasibility of monitoring such detonations using seismic networks, I have compiled actual hypocentral errors for 163 shallow borehole detonations used for seismic refraction experiments in northern California. The charge size used for these refraction detonations averaged about 1,000 kg, a size that has been used in terrorist attacks (Holzer et al....

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