The Seismic Record (Apr 2022)
The Far Side of Mars: Two Distant Marsquakes Detected by InSight
- Anna C. Horleston,
- John F. Clinton,
- Savas Ceylan,
- Domenico Giardini,
- Constantinos Charalambous,
- Jessica C. E. Irving,
- Philippe Lognonné,
- Simon C. Stähler,
- Géraldine Zenhäusern,
- Nikolaj L. Dahmen,
- Cecilia Duran,
- Taichi Kawamura,
- Amir Khan,
- Doyeon Kim,
- Matthieu Plasman,
- Fabian Euchner,
- Caroline Beghein,
- Éric Beucler,
- Quancheng Huang,
- Martin Knapmeyer,
- Brigitte Knapmeyer-Endrun,
- Vedran Lekić,
- Jiaqi Li,
- Clément Perrin,
- Martin Schimmel,
- Nicholas C. Schmerr,
- Alexander E. Stott,
- Eléonore Stutzmann,
- Nicholas A. Teanby,
- Zongbo Xu,
- Mark Panning,
- William B. Banerdt
Affiliations
- Anna C. Horleston
- ORCiD
- School of Earth Sciences, University of Bristol, Bristol, United Kingdom
- John F. Clinton
- ORCiD
- Swiss Seismological Service, ETH Zürich, Zürich, Switzerland
- Savas Ceylan
- ORCiD
- Institute of Geophysics, ETH Zürich, Zürich, Switzerland
- Domenico Giardini
- ORCiD
- Institute of Geophysics, ETH Zürich, Zürich, Switzerland
- Constantinos Charalambous
- ORCiD
- Department of Electrical and Electronic Engineering, Imperial College London, London, United Kingdom
- Jessica C. E. Irving
- ORCiD
- School of Earth Sciences, University of Bristol, Bristol, United Kingdom
- Philippe Lognonné
- ORCiD
- Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, France
- Simon C. Stähler
- ORCiD
- Institute of Geophysics, ETH Zürich, Zürich, Switzerland
- Géraldine Zenhäusern
- ORCiD
- Institute of Geophysics, ETH Zürich, Zürich, Switzerland
- Nikolaj L. Dahmen
- ORCiD
- Institute of Geophysics, ETH Zürich, Zürich, Switzerland
- Cecilia Duran
- ORCiD
- Institute of Geophysics, ETH Zürich, Zürich, Switzerland
- Taichi Kawamura
- ORCiD
- Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, France
- Amir Khan
- ORCiD
- Institute of Geophysics, ETH Zürich, Zürich, Switzerland
- Doyeon Kim
- ORCiD
- Institute of Geophysics, ETH Zürich, Zürich, Switzerland
- Matthieu Plasman
- ORCiD
- Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, France
- Fabian Euchner
- ORCiD
- Institute of Geophysics, ETH Zürich, Zürich, Switzerland
- Caroline Beghein
- ORCiD
- Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, California, U.S.A.
- Éric Beucler
- ORCiD
- Laboratoire de Planétologie et Géodynamique, Univ. Nantes, Univ. Angers, CNRS, Nantes, France
- Quancheng Huang
- ORCiD
- Department of Geophysics, Colorado School of Mines, Golden, Colorado, U.S.A.
- Martin Knapmeyer
- ORCiD
- DLR Institute of Planetary Research, Berlin, Germany
- Brigitte Knapmeyer-Endrun
- ORCiD
- Bensberg Observatory, University of Cologne, Bergisch Gladbach, Germany
- Vedran Lekić
- ORCiD
- Department of Geology, University of Maryland, College Park, Maryland, U.S.A.
- Jiaqi Li
- ORCiD
- Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, California, U.S.A.
- Clément Perrin
- ORCiD
- Laboratoire de Planétologie et Géodynamique, Univ. Nantes, Univ. Angers, CNRS, Nantes, France
- Martin Schimmel
- ORCiD
- Geosciences Barcelona—CSIC, Barcelona, Spain
- Nicholas C. Schmerr
- ORCiD
- Department of Geology, University of Maryland, College Park, Maryland, U.S.A.
- Alexander E. Stott
- ORCiD
- Institut Supérieur de l’Aéronautique et de l’Espace SUPAERO, Toulouse, France
- Eléonore Stutzmann
- ORCiD
- Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, France
- Nicholas A. Teanby
- ORCiD
- School of Earth Sciences, University of Bristol, Bristol, United Kingdom
- Zongbo Xu
- ORCiD
- Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, France
- Mark Panning
- ORCiD
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, U.S.A.
- William B. Banerdt
- ORCiD
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, U.S.A.
- DOI
- https://doi.org/10.1785/0320220007
- Journal volume & issue
-
Vol. 2,
no. 2
pp. 88 – 99
Abstract
For over three Earth years the Marsquake Service has been analyzing the data sent back from the Seismic Experiment for Interior Structure—the seismometer placed on the surface of Mars by NASA’s InSight lander. Although by October 2021, the Mars seismic catalog included 951 events, until recently all these events have been assessed as lying within a radius of 100° of InSight. Here we report two distant events that occurred within days of each other, located on the far side of Mars, giving us our first glimpse into Mars’ core shadow zone. The first event, recorded on 25 August 2021 (InSight sol 976), shows clear polarized arrivals that we interpret to be PP and SS phases at low frequencies and locates to Valles Marineris, 146° ± 7° from InSight. The second event, occurring on 18 September 2021 (sol 1000), has significantly more broadband energy with emergent PP and SS arrivals, and a weak phase arriving before PP that we interpret as Pdiff. Considering uncertain pick times and poorly constrained travel times for Pdiff, we estimate this event is at a distance between 107° and 147° from InSight. With magnitudes of MwMa 4.2 and 4.1, respectively, these are the largest seismic events recorded so far on Mars.
