Scientists at the U.S. Geological Survey (USGS) have developed a three-component borehole seismometer with leveling capability for use during earthquake site response studies.
There are several reasons for using such a seismometer in earthquake studies. For example, the low velocity and high attenuation of weathered near-surface rocks strongly influence the amplitude and phase characteristics of seismic waves. Therefore, it is important for earthquakesource and seismic-shear-wave-polarization studies to place seismometers at depths below weathered rocks. Borehole seismometers can be used as elements of a seismic network for determining earthquake locations and magnitudes.
More info: Hsi-Ping Liu, 650-329-5643, liu@usgs.gov
