Basal Scarp (Olympus Mons, Mars)

Weller, M. B.

doi:10.1007/978-1-4614-3134-3_14

Cited by 1 publication

(1 citation statement)

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“…These events have distances around 90° as computed by MQS. We find a backazimuth of 85° for S1153a (Figure 8a), and locate both of these events in the approximate area of Olympus Mons (Figure 6), which is surrounded by a basal scarp of 2–10 km height and thrust faults as young as <40 Ma (Weller, 2015), as well as potential grabens cutting through young, late Amazonian terrain (Hargitai & Gulick, 2018). S0185a and S0234c can be paired with the impact S1094b I .…”

Section: Discussionmentioning

confidence: 89%

Mapping the Seismicity of Mars With InSight

Ceylan,

Giardini,

Clinton

et al. 2023

JGR Planets

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The InSight seismometers have recorded more than 1300 events. Ninety‐eight of these, named the low‐frequency family, show energy predominantly below 1 Hz down to ∼0.1 Hz. The Marsquake Service identified seismic phases and computed distances for 42 of these marsquakes, 24 of which have backazimuths. Hence, the locations of the majority of low‐frequency family events remain undetermined. Here, we use an envelope shape similarity approach to determine event classes and distances, and introduce an alternative method to estimate the backazimuth. In our analysis, we use the highest quality marsquakes with known distances as templates, including the largest event S1222a, and assign new distances to similar group of events for which distance estimates were not previously available. We find the Tharsis region to be more active than initially perceived on the basis of 5 newly located events near Valles Marineris and Olympus Mons. We relocate two marsquakes with little or no S‐wave energy in the NE of the Elysium Bulge. The event epicenters in Cerberus Fossae follow a north‐south trend due to uncertainties in location, while the fault system is in the NW‐SE direction; therefore, these events are re‐projected along the observed fault system based on our interpretations. The marsquakes in our interpreted catalog are predominantly observed in the northern hemisphere of Mars above the equatorial dichotomy boundary.

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Section: Discussionmentioning

confidence: 89%