Eric Beucler
Nantes Université, Université d’Angers, Le Mans Université, CNRS, UMR 6112, Laboratoire de Planétologie et Géosciences, UAR 3281, Observatoire des Sciences de l’Univers de Nantes Atlantique, Nantes, France
Author ProfileClément Perrin
Nantes Université, Université d’Angers, Le Mans Université, CNRS, UMR 6112, Laboratoire de Planétologie et Géosciences, UAR 3281, Observatoire des Sciences de l’Univers de Nantes Atlantique, Nantes, France
Author ProfileAbstract
The InSight mission (Interior Exploration using Seismic Investigations,
Geodesy and Heat Transport) has been collecting high-quality seismic
data from Mars since February 2019, shortly after its landing. The
Marsquake Service (MQS) is the team responsible for the prompt review of
all seismic data recorded by the InSight’s seismometer (SEIS), marsquake
event detection, and curating seismicity catalogues. Until sol 1011 (end
of September 2021), MQS have identified 951 marsquakes that we interpret
to occur at regional and teleseismic distances, and 1062 very short
duration events that are most likely generated by local thermal stresses
nearby the SEIS package. Here, we summarize the seismic data collected
until sol 1011, version 9 of the InSight seismicity catalogue. We focus
on the significant seismicity that occurred after sol 478, the end date
of version 3, the last catalogue described in a dedicated paper. In this
new period, almost a full Martian year of new data has been collected,
allowing us to observe seasonal variations in seismicity that are
largely driven by strong changes in atmospheric noise that couples into
the seismic signal. Further, the largest, closest and most distant
events have been identified, and the number of fully located events has
increased from 3 to 7. In addition to the new seismicity, we document
improvements in the catalogue that include the adoption of
InSight-calibrated Martian models and magnitude scales, the inclusion of
additional seismic body-wave phases, and first focal mechanism solutions
for three of the regional marsquakes at distances ~30
degrees.