125 results found
Grant JA, Warner NH, Weitz CM, et 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
Panning MP, Pike WT, Lognonne P, et al., 2020, On-Deck Seismology: Lessons from InSight for Future Planetary Seismology, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 125, ISSN: 2169-9097
Lognonne P, Banerdt WB, Pike WT, et al., 2020, Constraints on the shallow elastic and anelastic structure of Mars from InSight seismic data, NATURE GEOSCIENCE, Vol: 13, Pages: 213-+, ISSN: 1752-0894
NASA’s InSight (Interior exploration using Seismic Investigations, Geodesy and Heat Transport) mission landed in Elysium Planitia on Mars on 26 November 2018. It aims to determine the interior structure, composition and thermal state of Mars, as well as constrain present-day seismicity and impact cratering rates. Such information is key to understanding the differentiation and subsequent thermal evolution of Mars, and thus the forces that shape the planet’s surface geology and volatile processes. Here we report an overview of the first ten months of geophysical observations by InSight. As of 30 September 2019, 174 seismic events have been recorded by the lander’s seismometer, including over 20 events of moment magnitude Mw = 3–4. The detections thus far are consistent with tectonic origins, with no impact-induced seismicity yet observed, and indicate a seismically active planet. An assessment of these detections suggests that the frequency of global seismic events below approximately Mw = 3 is similar to that of terrestrial intraplate seismic activity, but there are fewer larger quakes; no quakes exceeding Mw = 4 have been observed. The lander’s other instruments—two cameras, atmospheric pressure, temperature and wind sensors, a magnetometer and a radiometer—have yielded much more than the intended supporting data for seismometer noise characterization: magnetic field measurements indicate a local magnetic field that is ten-times stronger than orbital estimates and meteorological measurements reveal a more dynamic atmosphere than expected, hosting baroclinic and gravity waves and convective vortices. With the mission due to last for an entire Martian year or longer, these results will be built on by further measurements by the InSight lander.
Brinkman N, Schmelzbach C, Sollberger D, et al., 2020, The first active seismic experiment on Mars to characterize the shallow subsurface structure at the InSight landing site, Pages: 4756-4760
© 2019 SEG In November 2018, the InSight lander successfully touched down in the Elysium Planitia plain on Mars. Since then, two scientific instruments were deployed directly onto the surface of Mars: (1) SEIS, a package consisting of two three-component seismic sensors and (2) HP3, the heat flow and physical properties package. HP3 includes a self-hammering penetrator (mole) that hammers itself into the subsurface of Mars to a maximum depth of five meters. The mole hammering generates seismic signals that are recorded by SEIS and can be used to image the shallow subsurface just below the landing site. Even though not included in the level-one mission's objectives, this opportunistic seismic experiment is, to the best of our knowledge, the first active seismic experiment ever conducted on a different planet. Here, we discuss the most important aspects of the implementations of this opportunistic experiment.
Liu H, Pike WT, Charalambous C, et al., 2019, Passive Method for Reducing Temperature Sensitivity of a Microelectromechanical Seismic Accelerometer for Marsquake Monitoring Below 1 Nano-g, PHYSICAL REVIEW APPLIED, Vol: 12, ISSN: 2331-7019
Sollberger D, Garcia R, Giardini D, et al., 2019, Sparse Reconstruction of Aliased Seismic Signals Recorded during the Insight Mars Mission, Pages: 376-380
© 2019 IEEE. The NASA InSight lander successfully placed a seismometer on the surface of Mars. Alongside, a hammering device was deployed that penetrated into the ground to attempt the first measurements of the planetary heat flow of Mars. The hammering generated repeated seismic signals that were registered by the seismometer. These signals can potentially be used to image the shallow subsurface just below the lander. However, the frequencies excited by the hammering probe widely exceed the Nyquist frequency dictated by the seis-mometer's sampling rate. Here, we propose an algorithm to reconstruct the seismic signals beyond the classical sampling theorem. 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. This allows us to reconstruct signals by enforcing a sparsity constraint in a modified Radon transform domain.
Banfield D, Spiga A, Newman C, et al., Mars Atmospheric Science from NASA’s InSight Lander, Ninth International Conference on Mars
Teanby NA, Myhill R, Horleston A, et al., 2019, Seismic Noise Polarization as a Measure of Wind Direction and Speed by Correlating InSight SEIS/APSS Observations on Mars
de Raucourt S, Lognonné P, Robert O, et al., 2019, The Very Broad Band Sensor of SEIS/InSight: Validation from Cruise to Mars Ground
Panning MP, Pike WT, Lognonné P, et al., 2019, InSight Lessons on Science Potential from On-Deck Operation of a Broadband Seismometer
Warren T, Pike WT, Stott AE, et al., 2019, InSight Short Period Seismometers Detection of Dust Devils on Mars
McClean JB, Pike WT, Charalambous C, et al., 2019, Operation of the InSight Short Period (SP) Seismometers During Cruise
Murdoch N, Lorenz R, Spiga A, et al., 2019, Predicting the Meteorological and Seismic Signals of Martian Dust-Devil Vortices as Observed on the InSight Lander
Lognonne P, Banerdt WB, Giardini D, et al., 2019, SEIS: insight's seismic experiment for internal structure of Mars, Space Science Reviews, Vol: 215, ISSN: 0038-6308
By the end of 2018, 42 years after the landing of the two Viking seismometers on Mars, InSight will deploy onto Mars’ surface the SEIS (Seismic Experiment for Internal Structure) instrument; a six-axes seismometer equipped with both a long-period three-axes Very Broad Band (VBB) instrument and a three-axes short-period (SP) instrument. These six sensors will cover a broad range of the seismic bandwidth, from 0.01 Hz to 50 Hz, with possible extension to longer periods. Data will be transmitted in the form of three continuous VBB components at 2 sample per second (sps), an estimation of the short period energy content from the SP at 1 sps and a continuous compound VBB/SP vertical axis at 10 sps. The continuous streams will be augmented by requested event data with sample rates from 20 to 100 sps. SEIS will improve upon the existing resolution of Viking’s Mars seismic monitoring by a factor of ∼2500 at 1 Hz and ∼200000 at 0.1 Hz. An additional major improvement is that, contrary to Viking, the seismometers will be deployed via a robotic arm directly onto Mars’ surface and will be protected against temperature and wind by highly efficient thermal and wind shielding. Based on existing knowledge of Mars, it is reasonable to infer a moment magnitude detection threshold of Mw∼3 at 40∘ epicentral distance and a potential to detect several tens of quakes and about five impacts per year. In this paper, we first describe the science goals of the experiment and the rationale used to define its requirements. We then provide a detailed description of the hardware, from the sensors to the deployment system and associated performance, including transfer functions of the seismic sensors and temperature sensors. We conclude by describing the experiment ground segment, including data processing services, outreach and education networks and provide a description of the format to be used for future data distribution.
Lognonné P, Banerdt WB, Pike WT, et al., SEIS: Overview, Deployment and First Science on the Ground, 50th Lunar and Planetary Science Conference
Pike WT, Lognonné P, Banerdt WB, et al., Results from the Short-Period (SP) Seismometers on the Mars InSight Mission: from Launch to Sol 40, 50th Lunar and Planetary Science Conference
Fayon L, Knapmeyer-Endrun B, Lognonne P, et al., 2018, A Numerical Model of the SEIS Leveling System Transfer Matrix and Resonances: Application to SEIS Rotational Seismology and Dynamic Ground Interaction, SPACE SCIENCE REVIEWS, Vol: 214, ISSN: 0038-6308
Stott AE, Charalambous C, Warren TJ, et al., 2018, Full-band signal extraction from sensors in extreme environments: The NASA InSight Microseismometer, IEEE Sensors Journal, Vol: 18, Pages: 9382-9392, ISSN: 1530-437X
Physically meaningful signal extraction from sensors deployed in extreme environments requires a combination of attenuation of confounding inputs and the removal of their residual using decorrelation techniques. In space applications where the resources for physical attenuation are limited, there is a necessity to apply the most effective post-processing analysis available. This paper describes the extraction of the seismic signal from an MEMS microseismometer to be deployed on the surface of Mars. The signal processing, which covers the full bandwidth 1 × 10 -5 Hz to 40 Hz, uses a novel application of sensor fusion through an indirect Kalman Filter in combination with a thermal model of the microseismometer to remove the aseismic contribution of temperature over the frequency range. Owing to the full-band decorrelation, the analysis (based on pre-landing testing in analogous scenarios) produces both a characterization of the microseismomter and a signal processing approach for information retrieval on Mars, along with other planetary and terrestrial planetary deployments.
Hecht M, McClean J, Pike WT, et al., 2018, MOXIE, ISRU, and the History of In Situ Studies of the Hazards of Dust in Human Exploration of Mars, Dust in the Atmosphere of Mars and its Impact on Human Exploration, Editors: Levine, Winterhalter, Kerschmann, Pages: 225-252, ISBN: 978-1-5275-1172-9
Morgan P, Grott M, Knapmeyer-Endrun B, et al., 2018, A Pre-Landing Assessment of Regolith Properties at the InSight Landing Site, SPACE SCIENCE REVIEWS, Vol: 214, ISSN: 0038-6308
Golombek M, Grott M, Kargl G, et al., 2018, Geology and Physical Properties Investigations by the InSight Lander, SPACE SCIENCE REVIEWS, Vol: 214, ISSN: 0038-6308
Hurley J, Murdoch N, Teanby NA, et al., 2018, Isolation of Seismic Signal from InSight/SEIS-SP Microseismometer Measurements, SPACE SCIENCE REVIEWS, Vol: 214, ISSN: 0038-6308
McClean J, Merrison J, Iversen JJ, et al., Dust Loading and Pressure Drop of Fibrous Filters for Atmospheric In-Situ Resource Utilisation on Mars 2020, European Planetary Science Congress
Pike WT, Standley LM, Calcutt SB, et al., 2018, A BROAD-BAND SILICON MICROSEISMOMETER WITH 0.25 NG/RTHZ PERFORMANCE, 31st IEEE International Conference on Micro Electro Mechanical Systems (MEMS), Publisher: IEEE, Pages: 113-116, ISSN: 1084-6999
Panning MP, Staehler SC, Huang H-H, et al., 2018, Expected Seismicity and the Seismic Noise Environment of Europa, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 123, Pages: 163-179, ISSN: 2169-9097
Vance SD, Panning MP, Staehler S, et al., 2018, Geophysical Investigations of Habitability in Ice-Covered Ocean Worlds, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 123, Pages: 180-205, ISSN: 2169-9097
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