Martin Knapmeyer
A5025420560- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Space Science and Extraterrestrial Life
- Space Satellite Systems and Control
- Geological and Geochemical Analysis
- Geology and Paleoclimatology Research
- Seismic Waves and Analysis
- Earthquake Detection and Analysis
- Seismology and Earthquake Studies
- Seismic Imaging and Inversion Techniques
- Spacecraft and Cryogenic Technologies
- Marine and environmental studies
- Geophysics and Gravity Measurements
- Nuclear Physics and Applications
- Geophysics and Sensor Technology
- Methane Hydrates and Related Phenomena
- Stellar, planetary, and galactic studies
- Scientific Research and Discoveries
- Modular Robots and Swarm Intelligence
- Space exploration and regulation
- Reservoir Engineering and Simulation Methods
- Spaceflight effects on biology
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2014-2025
Planet
2014-2024
Institut für Lungenforschung
2015-2023
Astrogeology Science Center
2022
Planetary Science Institute
2009-2022
Deutsches Forschungsnetz
2011
German Research Centre for Artificial Intelligence
2004
Ruhr University Bochum
1999-2000
Clues to a planet's geologic history are contained in its interior structure, particularly core. We detected reflections of seismic waves from the core-mantle boundary Mars using InSight data and inverted these together with geodetic constrain radius liquid metal core 1830 ± 40 kilometers. The large implies martian mantle mineralogically similar terrestrial upper transition zone but differing Earth by not having bridgmanite-dominated lower mantle. inferred mean density 5.7 6.3 grams per...
The Philae lander, part of the Rosetta mission to investigate comet 67P/Churyumov-Gerasimenko, was delivered cometary surface in November 2014. Here we report precise circumstances multiple landings Philae, including bouncing trajectory and rebound parameters, based on engineering data conjunction with operational instrument data. These also provide information mechanical properties (strength layering) surface. first touchdown site, Agilkia, appears have a granular soft (with compressive...
Single seismometer structure Because of the lack direct seismic observations, interior Mars has been a mystery. Khan et al. , Knapmeyer-Endrun and Stähler used recently detected marsquakes from deployed during InSight mission to map (see Perspective by Cottaar Koelemeijer). likely 24- 72-kilometer-thick crust with very deep lithosphere close 500 kilometers. Similar Earth, low-velocity layer probably exists beneath lithosphere. The is highly enriched in radioactive elements that help heat...
We present the first observations of seismic waves propagating through core Mars. These observations, made using data collected by InSight geophysical mission, have allowed us to construct seismically constrained models for elastic properties Mars' core. observe core-transiting phase SKS from two farside events detected on Mars and measure travel times relative mantle traversing body waves. travels as a compressional wave, providing information about bulk modulus density. perform...
We present synthetic catalogs of Mars quakes, intended to be used for performance assessments future seismic networks on the planet. have compiled a new inventory compressional and extensional tectonic faults planet Mars, comprising 8500 with total length 680,000 km. The were mapped basis Orbiting Laser Altimeter (MOLA) shaded relief. Hence we expect assembled homogeneous data set, not biased by illumination viewing conditions image data. Updated models Martian crater statistics geological...
Abstract The instrument package SEIS (Seismic Experiment for Internal Structure) with the three very broadband and short‐period seismic sensors is installed on surface Mars as part of NASA's InSight Discovery mission. When compared to terrestrial installations, deployed in a harsh wind temperature environment that leads inevitable degradation quality recorded data. One ubiquitous artifact raw data an abundance transient one‐sided pulses often accompanied by high‐frequency spikes. These...
The physical properties of cometary nuclei observed today relate to their complex history and help constrain formation evolution. In this article, we review some the main focus in particular on thermal, mechanical, structural dielectric properties, emphasizing progress made during Rosetta mission. Comets have a low density 480 $\pm$ 220 kg m-3 permittivity 1.9 - 2.0, consistent with high porosity 70 80 %, are weak very global tensile strength $<$100 Pa, bulk thermal inertia 0 60 J K-1 m-2...
Abstract The seismometer deployed on the surface of Mars as part InSight mission ( In terior Exploration using S eismic I nvestigations, G eodesy and H eat T ransport) has recorded several hundreds marsquakes in first 478 sols after landing. majority these are classified high‐frequency (HF) events frequency range from approximately 1 to 10 Hz Mars' surface. All HF excite a resonance around 2.4 show two distinct but broad arrivals seismic energy that separated by up 450 s. Based content...
Abstract For over three Earth years the Marsquake Service has been analyzing data sent back from Seismic Experiment for Interior Structure—the seismometer placed on surface of Mars by NASA’s InSight lander. Although October 2021, seismic catalog included 951 events, until recently all these events have assessed as lying within a radius 100° InSight. Here we report two distant that occurred days each other, located far side Mars, giving us our first glimpse into Mars’ core shadow zone. The...
TandEM was proposed as an L-class (large) mission in response to ESA's Cosmic Vision 2015–2025 Call, and accepted for further studies, with the goal of exploring Titan Enceladus. The concept is perform situ investigations two worlds tied together by location properties, whose remarkable natures have been partly revealed ongoing Cassini–Huygens mission. These bodies still hold mysteries requiring a complete exploration using variety vehicles instruments. ambitious because its targets are most...
The migration of teleseismic receiver functions yields high-resolution images the crustal structure western Crete. Data were collected during two field campaigns in 1996 and 1997 by networks six 47 short-period three-component seismic stations, respectively. A total 1288 seismograms from 97 events restituted to true ground displacement within a period range 0.5 7 s. application noise-adaptive deconvolution filter new polarization analysis technique helped overcome problems with local coda...
Farside Explorer is a proposed Cosmic Vision medium-size mission to the farside of Moon consisting two landers and an instrumented relay satellite. The unique scientific platform in that it shielded from terrestrial radio-frequency interference, recorded primary differentiation evolution Moon, can be continuously monitored Earth–Moon L2 Lagrange point, there complete lack reflected solar illumination Earth. will exploit these properties make first radio-astronomy measurements most...
ABSTRACT In preparation for the National Aeronautics and Space Administration Interior exploration using Seismic Investigations, Geodesy Heat Transport (InSight) Discovery Program mission, Böse et al. (2018) calibrated magnitude scales marsquakes that incorporated prelaunch knowledge of Mars’ interior structure expected ambient instrumental noise. Now, data collected during first two years after successful deployment InSight very-broadband seismometer on Martian surface, we revise these...