SIO has 61 short period instruments that they operate as part of the OBSIP pool. The LC4x4-SP is an ocean-bottom instrument designed for use in seismic experiments that use either passive sources (e.g., earthquakes) or active sources (e.g. seismic air-gun surveys) to generate signals. The general characteristics of these instruments include:
− 24-bit analog-to-digital converter
− precision time base
− large capacity solid-state memory
− EdgeTech independent acoustics
− 3-axis 4.5 Hz geophone (active/microseismicity)
− ΗΤΙ hydrophone (active/microseismicity)