Borehole instruments are grouted in place 100 to 200 m below the surface to operate at the low noise levels required to capture small, short term transients.
Borehole Strainmeters measure crustal deformation on a timescale of less than a second to weeks or months. Pore pressure, temperature, and other instruments are often co-located in the borehole
Borehole Seismometers detect seismic waves at periods of several minutes or less.
Borehole Pore Pressure Sensors are designed to measure fluctuations in groundwater pressure to help characterize the hydrological response of sites at time scales of seconds to years.
Borehole Tiltmeters detect crustal deformation from deep earth processes such as volcanism and water table recharge/discharge over periods of seconds to weeks.
Last modified: Sunday, 11-May-2014 17:58:27 UTC