InSAR (Interferometric Synthetic Aperture Radar)

InSAR is a dedicated, science-driven satellite mission that will provide dense spatial (30 to 100 m) and temporal (every 8 days) measurements of the North American and Pacific plates as they move past each other and deform the surrounding regions. Precise comparisons of images acquired at different times (repeat-pass interferometry) can reveal differential horizontal and vertical motions accurate to 1 mm over all terrain types. This new radar imagery, in concert with PBO’s continuous GPS and strainmeter measurements, will enable mapping of surface displacements before, during and after earthquakes and volcanic eruptions, providing insights into fault mechanics and earthquake rupture. InSAR will enable mapping of earthquake strain accumulation across broad, actively deforming zones, highlighting regions of highest risk for future earthquakes. InSAR will permit imaging of the location and migration of magma through a volcanic system that may lead to an eruption, and will also provide a tool for mapping subsidence induced by petroleum production and ground water withdrawal.