ORCID Profile
0000-0001-6913-5577
Current Organisation
Malin Space Science Systems
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Publisher: American Association for the Advancement of Science (AAAS)
Date: 28-10-2022
Abstract: Two >130-meter-diameter impact craters formed on Mars during the later half of 2021. These are the two largest fresh impact craters discovered by the Mars Reconnaissance Orbiter since operations started 16 years ago. The impacts created two of the largest seismic events (magnitudes greater than 4) recorded by InSight during its 3-year mission. The combination of orbital imagery and seismic ground motion enables the investigation of subsurface and atmospheric energy partitioning of the impact process on a planet with a thin atmosphere and the first direct test of martian deep-interior seismic models with known event distances. The impact at 35°N excavated blocks of water ice, which is the lowest latitude at which ice has been directly observed on Mars.
Publisher: Elsevier BV
Date: 2021
Publisher: American Geophysical Union (AGU)
Date: 07-2022
DOI: 10.1029/2021JE007145
Abstract: We present a catalog of new impacts on Mars. These craters formed in the last few decades, constrained with repeat orbital imaging. Crater diameters range from 58 m down to m. For each impact, we report whether it formed a single crater or a cluster (58% clusters) albedo features of the blast zone (88% halos 64% linear rays 10% arcuate rays majority dark‐toned 4% light‐toned 14% dual‐toned) and exposures of ice (4% definite 2% possible). We find no trends in the occurrences of clusters with latitude, elevation, or impact size. Albedo features do not depend on atmospheric fragmentation. Halos are more prevalent at lower elevations, indicating an atmospheric pressure dependence and around smaller impacts, which could be an observational bias. Linear rays are more likely to form from larger impacts into more consolidated material and may be enhanced by lower atmospheric pressure at higher elevations. Light‐ and dual‐toned blast zones occur in specific regions and more commonly around larger impacts, indicating excavation of compositionally distinct material. Surfaces covered with bright dust lacking cohesion are favored to form detectable surface features. The slope of the cumulative size frequency distribution for this data set is 2.2 for diameters m (differential slope 2.9), significantly shallower than the slope of new lunar craters. We believe that no systematic biases exist in the Martian data set sufficient to explain the discrepancy. This catalog is complete at the time of writing, although observational biases exist, and new discoveries continue.
Publisher: American Geophysical Union (AGU)
Date: 08-2020
DOI: 10.1029/2020JE006382
Location: United States of America
Location: United States of America
No related grants have been discovered for Michael Malin.