John‐Robert Scholz
A5020107638- Planetary Science and Exploration
- earthquake and tectonic studies
- Seismic Waves and Analysis
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Astro and Planetary Science
- Seismic Imaging and Inversion Techniques
- Seismology and Earthquake Studies
- Earthquake Detection and Analysis
- Geology and Paleoclimatology Research
- Geophysics and Sensor Technology
- Geochemistry and Geologic Mapping
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
- Space Satellite Systems and Control
- Space Exploration and Technology
- Geological and Geophysical Studies Worldwide
- Scientific Research and Discoveries
- Geological Modeling and Analysis
- Underwater Acoustics Research
- Hydrocarbon exploration and reservoir analysis
- Oceanographic and Atmospheric Processes
- Environmental Monitoring and Data Management
- Marine and environmental studies
- Anomaly Detection Techniques and Applications
Max Planck Institute for Solar System Research
2019-2022
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2021
Milwaukee Public Schools
2020
Écologie Marine Tropicale des Océans Pacifique et Indien
2016-2019
Université Paris Cité
2016-2019
Institut de physique du globe de Paris
2016-2019
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...
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...
The InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) mission began collecting high quality seismic data on Mars in February 2019. This manuscript documents the seismicity observed by SEIS, InSight's seismometer, from this time until end of March 2020. Within project, Marsquake Service (MQS) is responsible for prompt review all collected InSight, detection events that are likely to be origin, curation release catalogues. In first year collection, MQS...
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 InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) mission landed on the surface of Mars November 26, 2018. One scientific instruments in payload that is essential to SEIS package (Seismic Experiment for Interior Structure) which includes a very broadband short period seismometer. More than one year since landing, continues be fully operational has been collecting an exceptional data set contains not only signals seismic origins, but also noise...
Abstract Since February 2019, NASA's InSight lander is recording seismic signals on the planet Mars, which, for first time, allows to observe ongoing tectonic processes with geophysical methods. A number of Marsquakes have been located in Cerberus Fossae graben system Elysium Planitia and further west, Orcus Patera depression. We present a study focal mechanisms three well‐recorded events (S0173a, S0183a, S0235b) determine dominating source region. infer all predominantly extensional...
Abstract. RHUM-RUM is a German-French seismological experiment based on the sea floor surrounding island of La Réunion, western Indian Ocean (Barruol and Sigloch, 2013). Its primary objective to clarify presence or absence mantle plume beneath Reunion volcanic hotspot. RHUM-RUM's central component 13-month deployment (October 2012 November 2013) 57 broadband ocean bottom seismometers (OBS) hydrophones over an area 2000 × km2 The array contained 48 wideband OBS from German DEPAS pool 9 French...
The Seismic Experiment for Interior Structure (SEIS) of the InSight mission to Mars, has been providing direct information on Martian interior structure and dynamics that planet since it landed. Compared seismic recordings Earth, ground motion measurements acquired by SEIS Mars are made under dramatically different ambient noise conditions, but include idiosyncratic signals arise from coupling between sensors spacecraft components. This work is synthesize what known about these signal types,...
Abstract Seismic observations involve signals that can be easily masked by noise injection. For the NASA Mars lander InSight, atmosphere is a significant contributor, impeding identification of seismic events for two‐thirds Martian day. While below seen at even quietest sites on Earth, amplitude also considerably lower, requiring an understanding and quantification environmental injection unprecedented levels. Mars’ ground are continuously coupled system, although atmospheric functions...
Constraining the thermal and compositional state of mantle is crucial for deciphering formation evolution Mars. Mineral physics predicts that Mars’ deep demarcated by a seismic discontinuity arising from pressure-induced phase transformation mineral olivine to its higher-pressure polymorphs, making depth this boundary sensitive both temperature composition. Here, we report on detection midmantle using data collected NASA’s InSight Mission Mars matches expected sharpness postolivine...
Abstract Seismic noise recorded at the surface of Mars has been monitored since February 2019, using InSight seismometers. This can reach −200 dB. It is 500 times lower than on Earth night and it increases 30 dB during day. We analyze its polarization as a function time frequency in band 0.03–1 Hz. use degree to extract signals with stable independent their amplitude type polarization. detect polarized all frequencies times. Glitches correspond linear which are more abundant night. For...
ABSTRACT The National Aeronautics and Space Administration’s (NASAs) Interior exploration using Seismic Investigations, Geodesy Heat Transport (InSight) lander successfully touched down on Mars in November 2018, and, for the first time, a seismometer was deployed surface of planet. seismic recordings reveal diurnal seasonal changes broadband noise level that are consistent with variations local atmospheric conditions. data include variety spectral peaks, which interpreted as wind-excited,...
Abstract Mars is the first extraterrestrial planet with seismometers (Seismic Experiment for Interior Structure, SEIS) deployed directly on its surface in framework of Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) mission. The lack strong Marsquakes, however, strengthens need seismic noise studies to additionally constrain Martian structure. autocorrelations single‐station recordings permit determination zero‐offset reflection response underneath SEIS. We...
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...
We present two independent, automated methods for estimating the absolute horizontal misorientation of seismic sensors. apply both to 44 free-fall ocean-bottom seismometers (OBSs) RHUM-RUM experiment (http://www.rhum-rum.net/). The techniques measure 3-D directions particle motion (1) P-waves and (2) Rayleigh waves earthquake recordings. For P-waves, we used a principal component analysis determine motions (polarizations) in multiple frequency passbands. correct polarization deviations due...
Abstract Ultraslow spreading ridges form the slowest divergent plate boundaries and exhibit distinct processes in volcanically active magmatic sections intervening amagmatic sections. Local seismicity studies of ultraslow until now cover only parts segments give insight into at confined locations. Here, we present a microseismicity data set that allows to study on scale entire segments. Our network 26 ocean bottom seismometers covered around 160 km along axis Knipovich Ridge Greenland Sea...
Abstract We present a new class of seismic signals that are recorded by the seismometer placed on surface Mars as part NASA InSight mission. The signals, termed super high frequency (SF) events, short duration (∼20 s), often similar in amplitude, and feature high‐frequency energy between ∼5 30 Hz is dominant horizontal components. For detection characterization SF we employ available continuous 20 samples per second (sps) data from Very Broadband instrument. Due to bandwidth limitations, 100...
ABSTRACT The Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) seismometer was deployed to the surface of Mars in December 2018–February 2019. specific deployment conditions, which are very different from those a standard broadband instrument on Earth, result resonances caused by parts sensor assembly (SA) that recorded seismometer. Here, we present characterize known be SA their causes aid interpretation seismic signals observed Mars. Briefly, there at...
ABSTRACT The seismic noise recorded by the Interior Exploration using Seismic Investigations, Geodesy, and Heat Transport (InSight) seismometer (Seismic Experiment for Structure [SEIS]) has a strong daily quasi-periodicity numerous transient microevents, associated mostly with an active Martian environment wind bursts, pressure drops, in addition to thermally induced lander instrument cracks. That is far from Earth’s microseismic noise. Quantifying importance of nonstochasticity identifying...
The rate of occurrence High Frequency (HF) marsquakes, as recorded by InSight at Homestead Hollow, Elysium Planitia, increased after about LS=33∘, and ceased almost completely LS=187∘, following an apparently seasonal variation with a peak near aphelion. We define seismic models based on the declination Sun, annual solar tides, CO2 cycle measured atmospheric pressure. Evaluation Akaike weights evidence ratios shows that Sun is most likely, least likely driver this activity, although...