Seismology on Titan: A Seismic Signal and Noise Budget in Preparation for Dragonfly
Session: InSight Seismology on Mars: Results From the First (Earth) Year of Data and Prospects for the Futur
Type: Oral
Date: 4/28/2020
Time: 11:30 AM
Room: 115
Description:
The Dragonfly mission to Titan was recently selected to be the next NASA New Frontiers mission, launching in 2026 and exploring Titan from 2034–2037. Among other instruments, it would include a geophysical and meteorological package (DraGMet), that would give us our first seismic measurements of an icy ocean world. While there are literature discussions of the kinds of seismic observations that we may expect to see in icy ocean worlds, quantitative estimates of the amplitudes and uncertainties of likely seismic signal and noise sources on Titan for the Dragonfly mission are critical. In this study we begin initial quantification of likely signal and noise from (a) icequakes in Titan’s shell scaled by tidal dissipation energy based on generalized approaches applied to tidally active worlds, (b) published estimates of microseismic noise due to wave interaction in methane/ethane seas and (c) atmospheric noise based on measurements from the InSight seismic deployment on Mars and limited data from Venera landers on Venus scaled by atmospheric acoustic impedance and solar energy flux or by expected dynamic wind pressure. We will also discuss possible noise from currents in the subsurface ocean, lander-generated noise (both due to Dragonfly activities and wind interactions with the lander), as well as more exotic sources like “booming dunes” which are observed on Earth and may be relevant to the Titan dunefields at Dragonfly's initial landing site. These signal and noise estimates will be compared with sensitivity of planetary seismic instrumentation to better constrain the probability of observing different seismic signals.
Presenting Author: Mark P. Panning
Authors
Mark P Panning mark.p.panning@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States Presenting Author
Corresponding Author
|
Ralph D Lorenz ralph.lorenz@jhuapl.edu Johns Hopkins University, Laurel, Maryland, United States |
Hiroaki Shiraishi siraisi@planeta.sci.isas.jaxa.jp JAXA Institute of Space and Astronautical Science, Sagamihara, , Japan |
Ryuhei Yamada ryamada@u-aizu.ac.jp University of Aizu, Aizu-Wakamatsu City, , Japan |
Simon Stähler simon.staehler@erdw.ethz.ch ETH, Zürich, , Switzerland |
Elizabeth Turtle Elizabeth.Turtle@jhuapl.edu Johns Hopkins University, Laurel, Maryland, United States |
Terry Hurford terry.a.hurford@nasa.gov NASA Goddard Space Filed Center, Greenbelt, Maryland, United States |
Naomi Murdoch naomi.murdoch@isae.fr ISAE-SUPAERO, Toulouse, , France |
Steven D Vance steven.d.vance@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States |
Seismology on Titan: A Seismic Signal and Noise Budget in Preparation for Dragonfly
Category
Insight Seismology on Mars: Results From the First (Earth) Year of Data and Prospects for the Future