Working models for spatial distribution and level of Mars' seismicity

Details Working models for spatial distribution and level of Mars' seismicity Working models for spatial distribution and level of Mars' seismicity

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgre..11111006k&link_type=abstract

Journal of Geophysical Research, Volume 111, Issue E11, CiteID E11006

Physics

17

Planetary Sciences: Solar System Objects: Mars, Planetary Sciences: Solid Surface Planets: Tectonics (8149), Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Structural Geology: Fractures And Faults, Tectonophysics: Planetary Tectonics (5475)

Scientific paper

We present synthetic catalogs of Mars quakes, intended to be used for performance assessments of future seismic networks on the planet. We have compiled a new inventory of compressional and extensional tectonic faults for the planet Mars, comprising 8500 faults with a total length of 680,000 km. The faults were mapped on the basis of Mars Orbiting Laser Altimeter (MOLA) shaded relief. Hence we expect to have assembled a homogeneous data set, not biased by illumination and viewing conditions of image data. Updated models of Martian crater statistics and geological maps were used to assign new maximum ages to all faults. On the basis of the fault catalog, spatial distributions of seismicity were simulated, using assumptions on the available annual seismic moment budget, the moment-frequency relationship, and a relation between rupture length and released moment. We have constructed five different models of Martian seismicity, predicting an annual moment release between 3.42 × 1016 Nm and 4.78 × 1018 Nm and up to 572 events with magnitudes greater than 4 per year as upper limit end-member case. Most events are expected on the Tharsis shield, but minor seismic centers are expected south of Hellas and north of Utopia Planitia.

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