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- W2912232439 abstract "Abstract Following observations of mobilized boulder trail populations from Cerberus Fossae, Mars, that have been interpreted as possible evidence of large‐magnitude marsquakes rupturing for distances of ~207 km along exposed active faults, additional boulder trail populations were measured along shorter faults within the region of Grjota Valles (50‐ to 150‐km length) to test the hypotheses that (1) these faults are also candidate locations for marsquakes and (2) that marsquake magnitude might be smaller, limited by fault dimensions available for rupture. For a region containing two en echelon graben, boulder trail data define two anomalies with maxima in (a) boulder trails per kilometer and (b) maximum width of boulder trails, one that is ~116 km in length along strike and the other ~70 km in length along strike. Values for the maxima are 45 trails per kilometer and 5‐m mean trail width for the 70‐km‐long anomaly and 115 trails per kilometer with 5.3‐m mean trail width for the 116‐km‐long anomaly, above background values measured elsewhere along these faults of zero trails per kilometer with zero boulder trail widths. If combined with published data from Cerberus Fossae with an ~207‐km‐long anomaly in boulder trails per km (125 trails per kilometer maxima) and maximum mean boulder trail width (8.5‐m maximum trail width), the three data sets suggest correlations between the (a) along‐strike length of boulder trail anomalies, (b) boulder trails per kilometer, and (c) maximum boulder trail width. If interpreted as due to single marsquakes, and if the dimensions of these anomalies are a proxy for rupture length, when combined, one interpretation of this is that boulders have been mobilized by marsquakes and that the marsquake magnitude is proportional to the along‐strike length of the anomalies. In other words, the data suggest that marsquake magnitude, if that is the cause of the anomalies, is limited by fault length as expected for terrestrial seismically active faults. Such findings suggest that the Martian surface may have been shaken, in the very recent past, by large‐magnitude marsquakes. We discuss this in terms of the seismicity of Mars." @default.
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- W2912232439 date "2019-03-01" @default.
- W2912232439 modified "2023-10-14" @default.
- W2912232439 title "Possible Evidence for Variation in Magnitude for Marsquakes From Fallen Boulder Populations, Grjota Valles, Mars" @default.
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- W2912232439 doi "https://doi.org/10.1029/2018je005622" @default.
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