Professor Tom Pike

Li J, Beghein C, McLennan SM, Horleston AC, Charalambous C, Huang Q, Zenhausern G, Bozdag E, Pike WT, Golombek M, Lekic V, Lognonne P, Banerdt WBet al., 2022, Constraints on the martian crust away from the InSight landing site, NATURE COMMUNICATIONS, Vol: 13

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Ceylan S, Clinton JF, Giardini D, Stahler SC, Horleston A, Kawamura T, Bose M, Charalambous C, Dahmen NL, van Driel M, Duran C, Euchner F, Khan A, Kim D, Plasman M, Scholz J-R, Zenhausen G, Beucler E, Garcia RF, Kedar S, Knapmeyer M, Lognonne P, Panning MP, Perrin C, Pike WT, Stott AE, Banerdt WBet al., 2022, The marsquake catalogue from InSight, sols 0-1011, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, Vol: 333, ISSN: 0031-9201

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• Citations: 3

Posiolova LV, Lognonné P, Banerdt WB, Clinton J, Collins GS, Kawamura T, Ceylan S, Daubar IJ, Fernando B, Froment M, Giardini D, Malin MC, Miljković K, Stähler SC, Xu Z, Banks ME, Beucler É, Cantor BA, Charalambous C, Dahmen N, Davis P, Drilleau M, Dundas CM, Durán C, Euchner F, Garcia RF, Golombek M, Horleston A, Keegan C, Khan A, Kim D, Larmat C, Lorenz R, Margerin L, Menina S, Panning M, Pardo C, Perrin C, Pike WT, Plasman M, Rajšić A, Rolland L, Rougier E, Speth G, Spiga A, Stott A, Susko D, Teanby NA, Valeh A, Werynski A, Wójcicka N, Zenhäusern Get al., 2022, Largest recent impact craters on Mars: Orbital imaging and surface seismic co-investigation., Science, Vol: 378, Pages: 412-417, ISSN: 0036-8075

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.

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Kim D, Banerdt WB, Ceylan S, Giardini D, Lekic V, Lognonne P, Beghein C, Beucler E, Carrasco S, Charalambous C, Clinton J, Drilleau M, Duran C, Golombek M, Joshi R, Khan A, Knapmeyer-Endrun B, Li J, Maguire R, Pike WT, Samuel H, Schimmel M, Schmerr NC, Stahler SC, Stutzmann E, Wieczorek M, Xu Z, Batov A, Bozdag E, Dahmen N, Davis P, Gudkova T, Horleston A, Huang Q, Kawamura T, King SD, McLennan SM, Nimmo F, Plasman M, Plesa AC, Stepanova IE, Weidner E, Zenhausern G, Daubar IJ, Fernando B, Garcia RF, Posiolova L, Panning MPet al., 2022, Surface waves and crustal structure on Mars, SCIENCE, Vol: 378, Pages: 417-421, ISSN: 0036-8075

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• Citations: 5

Huang Q, Schmerr NC, King SD, Kim D, Rivoldini A, Plesa A-C, Samuel H, Maguire RR, Karakostas F, Lekić V, Charalambous C, Collinet M, Myhill R, Antonangeli D, Drilleau M, Bystricky M, Bollinger C, Michaut C, Gudkova T, Irving JCE, Horleston A, Fernando B, Leng K, Nissen-Meyer T, Bejina F, Bozdağ E, Beghein C, Waszek L, Siersch NC, Scholz J-R, Davis PM, Lognonné P, Pinot B, Widmer-Schnidrig R, Panning MP, Smrekar SE, Spohn T, Pike WT, Giardini D, Banerdt WBet al., 2022, Seismic detection of a deep mantle discontinuity within Mars by InSight., Proc Natl Acad Sci U S A, Vol: 119

Constraining the thermal and compositional state of the mantle is crucial for deciphering the formation and evolution of Mars. Mineral physics predicts that Mars' deep mantle is demarcated by a seismic discontinuity arising from the pressure-induced phase transformation of the mineral olivine to its higher-pressure polymorphs, making the depth of this boundary sensitive to both mantle temperature and composition. Here, we report on the seismic detection of a midmantle discontinuity using the data collected by NASA's InSight Mission to Mars that matches the expected depth and sharpness of the postolivine transition. In five teleseismic events, we observed triplicated P and S waves and constrained the depth of this discontinuity to be 1,006 [Formula: see text] 40 km by modeling the triplicated waveforms. From this depth range, we infer a mantle potential temperature of 1,605 [Formula: see text] 100 K, a result consistent with a crust that is 10 to 15 times more enriched in heat-producing elements than the underlying mantle. Our waveform fits to the data indicate a broad gradient across the boundary, implying that the Martian mantle is more enriched in iron compared to Earth. Through modeling of thermochemical evolution of Mars, we observe that only two out of the five proposed composition models are compatible with the observed boundary depth. Our geodynamic simulations suggest that the Martian mantle was relatively cold 4.5 Gyr ago (1,720 to 1,860 K) and are consistent with a present-day surface heat flow of 21 to 24 mW/m2.

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Brinkman N, Schmelzbach C, Sollberger D, ten Pierick J, Edme P, Haag T, Kedar S, Hudson T, Andersson F, van Driel M, Stahler S, Nicollier T, Robertsson J, Giardini D, Spohn T, Krause C, Grott M, Knollenberg J, Hurst K, Rochas L, Vallade J, Blandin S, Lognonne P, Pike WT, Banerdt WBet al., 2022, In Situ Regolith Seismic Velocity Measurement at the InSight Landing Site on Mars, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 127, ISSN: 2169-9097

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• Citations: 1

Charalambous C, Pike T, Fernando B, Stott A, Nissen-Meyer T, Lognonné Pet al., 2022, Denoising InSight: Determination of Mars’ lateral crustal variations through surface-wave identification

<jats:p>&amp;lt;p&amp;gt;For over three Earth years, NASA&amp;amp;#8217;s InSight mission has returned data from the Seismic Experiment for Interior Structure (SEIS) on Mars with over 1300 recorded marsquakes (Horleston et al., this issue), leading to numerous breakthroughs in determining the planet's structure (Khan et al., 2021; St&amp;amp;#228;hler et al., 2021; Knapmeyer-Endrun et al., 2021). However, a large number of detected marsquakes are contaminated by SEIS&amp;amp;#8217;s complex interaction with the Martian atmosphere which injects noise and couples into the seismic signal. Identification of surface waves, polarisation analysis and clear body-wave arrivals is therefore often inhibited by this strong atmospheric noise. Despite numerous identifications, only 12 events have so far been fully located. Detection and analysis of the seismic component thus requires separation from such aseismic signal sources.&amp;lt;/p&amp;gt;&amp;lt;p&amp;gt;Here we present a novel denoising model which exploits the strong correlation between the ground motion and the atmospheric conditions recorded at InSight. The approach exploits linearities in the noise injected by the atmosphere by using weather data measured by the lander, or in the absence of such data due to power constraints, the excitation of wind-sensitive lander modes that have been proven an effective atmospheric proxy in estimating this injection on Mars (Charalambous et al., 2021; Clinton et al., 2021; Dahmen et al., 2021). The output results in &amp;amp;#8220;demodulation&amp;amp;#8221;, i.e., the cancellation of any environmental noise and the effective isolation of the seismic signal power in time-frequency space. Our denoising approach is thus able to remove and decouple the environmental noise from the seismic signal to reveal features in the seismic event waveform that were previously hidden in the noise.&amp;lt;/p&amp;gt;&amp;lt;p&amp;gt;U

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Stott AE, Charalambous C, Warren TJ, Pike WT, Myhill R, Murdoch N, McClean JB, Trebi-Ollennu A, Lim G, Garcia RF, Mimoun D, Kedar S, Hurst KJ, Bierwirth M, Lognonne P, Teanby NA, Horleston A, Banerdt WBet al., 2021, The Site Tilt and Lander Transfer Function from the Short-Period Seismometer of InSight on Mars, BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, Vol: 111, Pages: 2889-2908, ISSN: 0037-1106

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• Citations: 4

Kim D, Davis P, Lekic V, Maguire R, Compaire N, Schimmel M, Stutzmann E, Irving JCE, Lognonne P, Scholz J-R, Clinton J, Zenhaeusern G, Dahmen N, Deng S, Levander A, Panning MP, Garcia RF, Giardini D, Hurst K, Knapmeyer-Endrun B, Nimmo F, Pike WT, Pou L, Schmerr N, Staehler SC, Tauzin B, Widmer-Schnidrig R, Banerdt WBet al., 2021, Potential Pitfalls in the Analysis and Structural Interpretation of Seismic Data from the Mars InSight Mission, BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, Vol: 111, Pages: 2982-3002, ISSN: 0037-1106

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• Citations: 19

Zweifel P, Mance D, ten Pierick J, Giardini D, Schmelzbach C, Haag T, Nicollier T, Ceylan S, Staehler S, van Driel M, Sollberger D, Euchner F, Clinton JF, Bierwirth M, Eberhardt M, Lognonne P, Pike WT, Banerdt WBet al., 2021, Seismic High-Resolution Acquisition Electronics for the NASA InSight Mission on Mars, BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, Vol: 111, Pages: 2909-2923, ISSN: 0037-1106

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• Citations: 5

Dahmen NL, Zenhausern G, Clinton F, Giardini D, Stabler SC, Ceylan S, Charalambous C, van Driel M, Hurst KJ, Kedar S, Lognonne P, Murdoch N, Myhill R, Panning MP, Pike WT, Schimmel M, Schmelzbach C, Scholz J-R, Stott AE, Stutzmann E, Banerdt WBet al., 2021, Resonances and Lander Modes Observed by InSight on Mars (1-9 Hz), BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, Vol: 111, Pages: 2924-2950, ISSN: 0037-1106

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• Citations: 16

Hurst K, Fayon L, Knapmeyer-Endrun B, Schmelzbach C, van Driel M, Ervin J, Kedar S, Pike WT, Calcutt S, Warren T, Charalambous C, Stott A, Bierwirth M, Lognonne P, de Raucourt S, Gabsi T, Nebut T, Robert O, Tillier S, Ceylan S, Bose M, Clinton J, Giardini D, Horleston A, Kawamura T, Khan A, Orhand-Mainsant G, Scholz J-R, Stahler S, Stevanovic J, Banerdt WBet al., 2021, Resonances of the InSight Seismometer on Mars, BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, Vol: 111, Pages: 2951-2963, ISSN: 0037-1106

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• Citations: 7

Knapmeyer M, Stahler SC, Daubar I, Forget F, Spiga A, Pierron T, van Driel M, Banfield D, Hauber E, Grott M, Mueller N, Perrin C, Jacob A, Lucas A, Knapmeyer-Endrun B, Newman C, Panning MP, Weber RC, Calef FJ, Bose M, Ceylan S, Charalambous C, Clinton J, Dahmen N, Giardini D, Horleston A, Kawamura T, Khan A, Mainsant G, Plasman M, Lemmon M, Lorenz R, Pike WT, Scholz J-R, Lognonne P, Banerdt Bet al., 2021, Seasonal seismic activity on Mars, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 576, ISSN: 0012-821X

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• Citations: 3

Sollberger D, Schmelzbach C, Andersson F, Robertsson JOA, Brinkman N, Kedar S, Banerdt WB, Clinton J, van Driel M, Garcia R, Giardini D, Grott M, Haag T, Hudson TL, Lognonné P, Pierick JT, Pike W, Spohn T, Stähler SC, Zweifel Pet al., 2021, A Reconstruction Algorithm for Temporally Aliased Seismic Signals Recorded by the InSight Mars Lander., Earth Space Sci, Vol: 8, ISSN: 2333-5084

In December 2018, the NASA InSight lander successfully placed a seismometer on the surface of Mars. Alongside, a hammering device was deployed at the landing site that penetrated into the ground to attempt the first measurements of the planetary heat flow of Mars. The hammering of the heat probe generated repeated seismic signals that were registered by the seismometer and can potentially be used to image the shallow subsurface just below the lander. However, the broad frequency content of the seismic signals generated by the hammering extends beyond the Nyquist frequency governed by the seismometer's sampling rate of 100 samples per second. Here, we propose an algorithm to reconstruct the seismic signals beyond the classical sampling limits. We exploit the structure in the data due to thousands of repeated, only gradually varying hammering signals as the heat probe slowly penetrates into the ground. In addition, we make use of the fact that repeated hammering signals are sub-sampled differently due to the unsynchronized timing between the hammer strikes and the seismometer recordings. This allows us to reconstruct signals beyond the classical Nyquist frequency limit by enforcing a sparsity constraint on the signal in a modified Radon transform domain. In addition, the proposed method reduces uncorrelated noise in the recorded data. Using both synthetic data and actual data recorded on Mars, we show how the proposed algorithm can be used to reconstruct the high-frequency hammering signal at very high resolution.

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Stahler SC, Khan A, Banerdt WB, Lognonne P, Giardini D, Ceylan S, Drilleau M, Duran AC, Garcia RF, Huang Q, Kim D, Lekic V, Samuel H, Schimmel M, Schmerr N, Sollberger D, Stutzmann E, Xu Z, Antonangeli D, Charalambous C, Davis PM, Irving JCE, Kawamura T, Knapmeyer M, Maguire R, Marusiak AG, Panning MP, Perrin C, Plesa A-C, Rivoldini A, Schmelzbach C, Zenhausern G, Beucler E, Clinton J, Dahmen N, van Driel M, Gudkova T, Horleston A, Pike WT, Plasman M, Smrekar SEet al., 2021, Seismic detection of the martian core, SCIENCE, Vol: 373, Pages: 443-+, ISSN: 0036-8075

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• Citations: 87

Khan A, Ceylan S, van Driel M, Giardini D, Lognonne P, Samuel H, Schmerr NC, Staehler SC, Duran AC, Huang Q, Kim D, Broquet A, Charalambous C, Clinton JF, Davis PM, Drilleau M, Karakostas F, Lekic V, McLennan SM, Maguire RR, Michaut C, Panning MP, Pike WT, Pinot B, Plasman M, Scholz J-R, Widmer-Schnidrig R, Spohn T, Smrekar SE, Banerdt WBet al., 2021, Upper mantle structure of Mars from InSight seismic data, SCIENCE, Vol: 373, Pages: 434-+, ISSN: 0036-8075

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• Citations: 61

Charalambous C, McClean JB, Baker M, Pike WT, Golombek M, Lemmon M, Ansan V, Perrin C, Spiga A, Lorenz RD, Banks ME, Murdoch N, Rodriguez S, Weitz CM, Grant JA, Warner NH, Garvin J, Daubar IJ, Hauber E, Stott AE, Johnson CL, Mittelholz A, Warren T, Navarro S, Sotomayor LM, Maki J, Lucas A, Banfield D, Newman C, Viudez-Moreiras D, Pla-Garcia J, Lognonne P, Banerdt WBet al., 2021, Vortex-Dominated Aeolian Activity at InSight's Landing Site, Part 1: Multi-Instrument Observations, Analysis, and Implications, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 126, ISSN: 2169-9097

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• Citations: 11

Compaire N, Margerin L, Garcia RF, Pinot B, Calvet M, Orhand-Mainsant G, Kim D, Lekic V, Tauzin B, Schimmel M, Stutzmann E, Knapmeyer-Endrun B, Lognonne P, Pike WT, Schmerr N, Gizon L, Banerdt WBet al., 2021, Autocorrelation of the Ground Vibrations Recorded by the SEIS-InSight Seismometer on Mars, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 126, ISSN: 2169-9097

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• Citations: 17

Brinkman N, Stahler SC, Giardini D, Schmelzbach C, Khan A, Jacob A, Fuji N, Perrin C, Lognonne P, Beucler E, Bose M, Ceylan S, Charalambous C, Clinton JF, van Driel M, Euchner F, Horleston A, Kawamura T, Knapmeyer-Endrun B, Mainsant G, Panning MP, Pike WT, Scholz J-R, Robertsson JOA, Banerdt WBet al., 2021, First Focal Mechanisms of Marsquakes, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 126, ISSN: 2169-9097

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• Citations: 21

Charalambous C, Stott AE, Pike WT, McClean JB, Warren T, Spiga A, Banfield D, Garcia RF, Clinton J, Stahler S, Navarro S, Lognonne P, Scholz J-R, Kawamura T, van Driel M, Bose M, Ceylan S, Khan A, Horleston A, Orhand-Mainsant G, Sotomayor LM, Murdoch N, Giardini D, Banerdt WBet al., 2021, A Comodulation Analysis of Atmospheric Energy Injection Into the Ground Motion at InSight, Mars, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 126, ISSN: 2169-9097

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• Citations: 14

van Driel M, Ceylan S, Clinton JF, Giardini D, Horleston A, Margerin L, Stahler SC, Bose M, Charalambous C, Kawamura T, Khan A, Orhand-Mainsant G, Scholz J-R, Euchner F, Knapmeyer M, Schmerr N, Pike WT, Lognonne P, Banerdt WBet al., 2021, High-Frequency Seismic Events on Mars Observed by InSight, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 126, ISSN: 2169-9097

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• Citations: 28

Nunn C, Pike WTT, Standley IMM, Calcutt SBB, Kedar S, Panning MPPet al., 2021, Standing on Apollo's Shoulders: A Microseismometer for the Moon, PLANETARY SCIENCE JOURNAL, Vol: 2

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• Citations: 4

Dahmen NL, Clinton JF, Ceylan S, van Driel M, Giardini D, Khan A, Stahler SC, Bose M, Charalambous C, Horleston A, Kawamura T, Orhand-Mainsant G, Scholz J-R, Euchner F, Pike WT, Weber RC, Lognonne P, Banerdt WBet al., 2021, Super High Frequency Events: A New Class of Events Recorded by the InSight Seismometers on Mars, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 126, ISSN: 2169-9097

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• Citations: 16

Clinton JF, Ceylan S, van Driel M, Giardini D, Staehler SC, Boese M, Charalambous C, Dahmen NL, Horleston A, Kawamura T, Khan A, Orhand-Mainsant G, Scholz J-R, Euchner F, Banerdt WB, Lognonne P, Banfield D, Beucler E, Garcia RF, Kedar S, Panning MP, Perrin C, Pike WT, Smrekar SE, Spiga A, Stott AEet al., 2021, The Marsquake catalogue from InSight, sols 0-478, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, Vol: 310, ISSN: 0031-9201

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• Citations: 56

Ceylan S, Clinton JF, Giardini D, Boese M, Charalambous C, van Driel M, Horleston A, Kawamura T, Khan A, Orhand-Mainsant G, Scholz J-R, Staehler SC, Euchner F, Banerdt WB, Lognonne P, Banfield D, Beucler E, Garcia RF, Kedar S, Panning MP, Pike WT, Smrekar SE, Spiga A, Dahmen NL, Hurst K, Stott AE, Lorenz RD, Schimmel M, Stutzmann E, ten Pierick J, Conejero V, Pardo C, Perrin Cet al., 2021, Companion guide to the marsquake catalog from InSight, Sols 0-478: Data content and non-seismic events, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, Vol: 310, ISSN: 0031-9201

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• Citations: 39

Scholz J-R, Widmer-Schnidrig R, Davis P, Lognonne P, Pinot B, Garcia RF, Hurst K, Pou L, Nimmo F, Barkaoui S, De Raucourt S, Knapmeyer-Endrun B, Knapmeyer M, Orhand-Mainsant G, Compaire N, Cuvier A, Beucler E, Bonnin M, Joshi R, Sainton G, Stutzmann E, Schimmel M, Horleston A, Bose M, Ceylan S, Clinton J, Van Driel M, Kawamura T, Khan A, Stahler SC, Giardini D, Charalambous C, Stott AE, Pike WT, Christensen UR, Banerdt WBet al., 2020, Detection, Analysis, and Removal of Glitches From InSight's Seismic Data From Mars, EARTH AND SPACE SCIENCE, Vol: 7

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• Citations: 45

McClean JB, Merrison JP, Iversen JJ, Azimian M, Wiegmann A, Pike WT, Hecht MHet al., 2020, Filtration of simulated Martian atmosphere for in-situ oxygen production, PLANETARY AND SPACE SCIENCE, Vol: 191, ISSN: 0032-0633

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• Citations: 2

Golombek M, Kass D, Williams N, Warner N, Daubar I, Piqueux S, Charalambous C, Pike WTet al., 2020, Assessment of InSight Landing Site Predictions, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 125, ISSN: 2169-9097

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• Citations: 25

Weitz CM, Grant JA, Golombek MP, Warner NH, Hauber E, Ansan V, Wilson SA, Charalambous C, Williams N, Calef F, Pike WT, Lethcoe-Wilson H, Maki J, DeMott A, Kopp Met al., 2020, Comparison of InSight Homestead Hollow to Hollows at the Spirit Landing Site, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 125, ISSN: 2169-9097

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• Citations: 8

Grant JA, Warner NH, Weitz CM, Golombek MP, Wilson SA, Baker M, Hauber E, Ansan V, Charalambous C, Williams N, Calef F, Pike WT, DeMott A, Kopp M, Lethcoe H, Banks MEet al., 2020, Degradation of Homestead Hollow at the InSight Landing Site Based on the Distribution and Properties of Local Deposits, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 125, ISSN: 2169-9097

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• Citations: 15