Thu. Jan 20th, 2022

Mars seismiske udrulning lægger grunden til fremtidige planetariske missioner Bulletin of the Seismological Society of America, Volume 111, Number 6, December 2021

About 1,000 days after the Mars InSight mission deployed SEIS, the first seismometer on the red planet, scientists analyze new seismic data and report instrument responses using that data to plan future planetary seismographs.

The reports in a special issue of Bulletin of the Seismological Society of America expand our ability to interpret seismic data beyond Earth, to prepare for future planned missions to the Moon, Mars and Saturn’s moon Titan, all of which have seismometer packages as part of their launch.

“Experiences from Apollo, Viking and now InSight on the design of planetary seismometers, their implementation and operation, and seismic signal processing and signal interpretation will help us perform the best seismic monitoring of these terrestrial bodies and lead to a better scientific understanding of our solar system through future missions, “write special issue editors Philippe Lognonné, Sharon Kedar and Victor C. Tsai in their introduction to the newspaper.

SEIS (The Seismic Experiment for Interior Structures) was deployed to Mars in November 2018 as part of NASA’s InSight mission, which began its scientific operations in March 2019. Data collected by the mission so far suggest that Mars is less seismically active than assumed, with largest marsh quake estimated to be 4.2.

However, the lack of large seismic events has allowed SEIS to listen to events with much lower amplitude and seismic “noise”. As of October 2020, there have been more than 400 seismic events that scientists can analyze, most of them high-frequency events. The quality of the seismometer and pressure sensors in the InSight mission has enabled scientists to investigate potential infrasound events as well. Scientists have also used some of the high-quality seismic events that have been recorded to better understand how the Martian crust and upper mantle disperse and attenuate seismic waves.

Several of the articles in the special issue explore the full spectrum of recorded seismic noise from Mars and determine how or whether these noises relate to the operation of SEIS and other aspects of the InSight lander. Noise data analyzed from lander and instrument sources can help construct the next generation of planetary seismometers and clarify the source of the signals they will detect. Other sources of non-Mars earthquake on the planet discovered by SEIS include dust devils and seasonal atmospheric changes.

Seismicity on Mars full of surprises, in the first consecutive year of data

More information:
Philippe Lognonné; Sharon Kedar; Victor C. Tsai, Introduction to the Special Question of Mars Seismology, Bulletin of the Seismological Society of America (2021). DOI: 10.1785 / 0120210260

Provided by the Seismological Society of America

Citation: Mars seismic rollout lays the groundwork for future planetary missions (2021, November 29) retrieved November 29, 2021 from

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