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EarthScope-Oceans

From EverybodyWiki Bios & Wiki


Response 4: Thank you, I will work on those points. Fritsebits (talk) 12:27, 24 May 2022 (UTC) I have now done so... moved and edited the content around and put it under MERMAID. Fritsebits (talk) 17:37, 2 June 2022 (UTC)


Response 3: Thank you for your consideration. Your feedback is not very detailed so I am groping around in the dark, despite having read as much as I could about neutrality etc. The closest related programs are Argo and EarthScope, and IRIS Consortium. Let me try to remove all references to particular institutions and people, maybe that is what you mean by "no advertising". Fritsebits (talk) 21:51, 15 January 2022 (UTC)

Response 2: Thank you, I am redressing some of the imbalance that arose from utilizing only peer-reviewed sources. I will be placing the project in more context - notably its sister programs Earthscope, the IRIS Consortium and the wider literature. I will illustrate the notoriety from news sources. I will highlight the public nature of the endeavor. There is no conflict of interest, I am not a paid editor or advancing my own interests, and I do not have any commercial stake in any of the activities listed. Rather I act out of what I see as an obligation to share the results from publicly funded research with the community that ultimately pays for it, i.e., the taxpayer. Please bear with me while I work through these points, and thank you for your help. Fritsebits (talk) 20:34, 10 January 2022 (UTC)

Response 1: Thank you, I have attempted to address your first comment by an additional paragraph, and started a new section with External Links, to which I've moved two of the links so far, and added a third. Fritsebits (talk) 03:26, 8 January 2022 (UTC)

EarthScope-Oceans
FoundedDecember 2015; 10 years ago (2015-12)
ServicesResearch, Education
Websitewww.earthscopeoceans.org

EarthScope-Oceans is an international academic consortium that collects seismic data using robotic mobile—drifting—diving platforms (profiling floats) in the world's oceans, and distributes them to scientific user communities, with the objective to plug the oceanic data coverage gap in earthquake detection.[1][2][3]

Funded in part by the US National Science Foundation (NSF), EarthScope-Oceans is not affiliated with NSF's EarthScope program. EarthScope is a trademark of the IRIS Consortium.

EarthScope-Oceans is one of 361 Decade Actions endorsed by the Intergovernmental Oceanographic Commission of UNESCO, part of the Ocean Observing Co-Design program, falling under the umbrella of the United Nations Decade of Ocean Science for Sustainable Development (2021-2030).

Instrumentation

EarthScope-Oceans' chief instrument platform is the Mobile Earthquake Recorder for Marine Areas by Independent Divers. MERMAID evolved from a first prototype,[4][5] developed and built by the Scripps Institution of Oceanography in partnership with Princeton University, to a second,[6][7] built by Teledyne Webb Research in collaboration with the University of Nice Sophia Antipolis, and now third-generation model, [8][9][10] operational today, commercialized by OSEAN SAS in Le Pradet, France.

Technical diagram of a third-generation MERMAID instrument
Technical diagram of a third-generation MERMAID instrument

MERMAID is a freely-drifting float equipped with a hydrophone to collect hydroacoustic data for the study of earthquakes worldwide.[11] Typically floating at a parking depth of 1500 m, the instrument uses a buoyancy engine (a hydraulic oil bladder system) to return to the surface for triggered data transmission (on average every 6-7 days) via the Iridium satellite constellation, to respond to on-demand data requests, and to receive mission parameter updates. MERMAID carries lithium-ion batteries, sufficient to power about 250 descend/ascend cycles, which translates to an instrument autonomy of about 5 years. A pressure sensor monitors descent depth, and a GPS receiver provides location and time corrections during the brief intervals that MERMAID surfaces (on average less than one hour).

Newer, multidisciplinary, models carry a conductivity-temperature-depth sensor to collect hydrographic profiles of ocean temperature and salinity (similar to those from the Argo program) during their voyages, and they can be additionally equipped with high-frequency hydrophones for the study of, e.g. cetacean, vocalizations.[12]

Scientific objectives

Imaging Earth's interior via the technique of seismic tomography is reliant on dense source-receiver distribution, or data coverage, but two thirds of the Earth's surface are covered by water. Increasing station density in the oceanic domain is an objective widely shared in the global seismological research community.[13][14][15] After the first detections of teleseismic events by first-generation MERMAID,[16] relatively small-scale deployments of second-generation MERMAID instruments in the Mediterranean, the Indian Ocean, and in the Pacific around the Galapagos, demonstrated MERMAID's potential for closing the oceanic seismic coverage gap, both for global and regional seismic events,[17][18] and for seismic tomography of the Earth's mantle.[19][20]

The expansion of the EarthScope-Oceans fleet to include new multidisciplinary MERMAID models adds oceanography, meteorology, climate science, and bioacoustics to the seismological domain of interest of the EarthScope-Oceans Consortium.

Network configuration

Sixty-seven third-generation MERMAIDs have been launched in the Pacific Ocean, the South China Sea, and the Mediterranean, from a variety of international (French, Japanese, Chinese) research vessels.

EarthScope-Oceans MERMAID array configuration as of January 15th, 2022
EarthScope-Oceans MERMAID array configuration as of January 15th, 2022

Data collection and distribution

EarthScope-Oceans is a member organization of the International Federation of Digital Seismograph Networks. Its network code is MH, and its doi 10.7914/SN/MH.

Every MERMAID instrumental sensor has a unique identifier. In contrast to conventional (land-based) seismometers or ocean-bottom seismometers (OBS), MERMAID instruments are passively adrift with the ocean currents: they do not remain at any fixed geographic location. Data from particular units are location-tagged hydroacoustic time-series as recorded at depth in the oceans. Data segments triggering transmission mostly contain pressure-wave signals from particular earthquakes worldwide,[21] but also noise generated by a variety of sources (e.g. microseisms or volcanic eruptions[22][23]) Since GPS signals do not penetrate under water, the actual location of recording specific events is derived from interpolation during post-processing.[24]

Seismic data from the US and French MERMAIDs are being deposited with the IRIS Consortium.[25] Primary seismoacoustic arrivals from distant teleseismic earthquakes are prioritized for automatic reporting,[26] although the complete records (and the year-long buffer, which is rarely retrievable) contain multiple other types of seismic arrivals.[27] Seismic waveforms are released to the public through the IRIS Data Management Center, after a rolling embargo period of typically two years.

Trajectory metadata are released by EarthScope-Oceans in near real-time. Float trajectories allow for the reconstruction of ocean currents, and are used in educational and outreach programs.[28]

References

  1. ↑ Jones, Nicola (2014). "Global seismic network takes to the seas". Nature. 507 (7491): 151. Bibcode:2014Natur.507..151J. doi:10.1038/507151a. PMID 24622184. Unknown parameter |s2cid= ignored (help)
  2. ↑ Hand, Eric (2015). "Ocean robots listen for earthquake echoes". Science. 349 (6252): 1033. Bibcode:2015Sci...349.1033H. doi:10.1126/science.349.6252.1033. PMID 26339002.
  3. ↑ Lopatka, Alex (2019). "Deploying seismometers where they're needed most: Underwater". Physics Today. doi:10.1063/PT.6.1.20190524a. Unknown parameter |s2cid= ignored (help)
  4. ↑ Simons, Frederik J; Nolet, Guust; Babcock, Jeff M.; Davis, Russ E.; Orcutt, John A. (2006). "A future for drifting seismic networks". Eos. 87 (31): 305, 307. Bibcode:2006EOSTr..87..305S. doi:10.1029/2006EO310002.
  5. ↑ "Plumbing the Depths". The Economist. 2008.
  6. ↑ Hello, Yan (2011). "Modern mermaids: New floats image the deep Earth". Eos. 92 (40): 337–338. Bibcode:2011EOSTr..92..337H. doi:10.1029/2011EO400001.
  7. ↑ Lubick, Naomi (2011). "MERMAIDs detect distant earthquakes". Nature. doi:10.1038/news.2011.583.
  8. ↑ Stokstad, Erik (2019). "These ocean floats can hear earthquakes, revealing mysterious structures deep inside Earth". Science. 364 (6437): 218–219. doi:10.1126/science.aax7339. Unknown parameter |s2cid= ignored (help)
  9. ↑ Hello, Yann; Nolet, Guust (2020). "Floating seismographs (MERMAIDS)". Encyclopedia of Solid Earth Geophysics. Encyclopedia of Earth Sciences Series: 1–6. doi:10.1007/978-3-030-10475-7_248-1. ISBN 978-3-030-10475-7. Unknown parameter |s2cid= ignored (help)
  10. ↑ Simons, Frederik J; Simon, Joel; Pipatprathanporn, Sirawich (2021). "Twenty-thousand leagues under the sea: Recording earthquakes with autonomous floats". Acoustics Today. 17 (2): 42–51. doi:10.1121/AT.2021.17.2.42. Unknown parameter |s2cid= ignored (help)
  11. ↑ "A seismic shift in the oceans". IRIS Data Services Newsletter. 19 (2). Summer 2017.
  12. ↑ Bonnieux, Sébastien; Cazau, Dorian; Mosser, Sébastien; Blay-Fornarino, Mireille; Hello, Yann; Nolet, Guust (2020). "MeLa: A programming language for a new multidisciplinary oceanographic float". Sensors. 20 (21): 6081. Bibcode:2020Senso..20.6081B. doi:10.3390/s20216081. PMC 7672633 Check |pmc= value (help). PMID 33114608 Check |pmid= value (help).
  13. ↑ Kohler, Monica D.; Hafner, Katrin; Park, Jeffrey; Irving, Jessica C. E.; Caplan-Auerbach, Jackie; Collins, John; Jonathan; Tréhu, Anne M.; Romanowicz, Barbara; Woodward, Robert L. (2020). "A plan for a long-term, automated, broadband seismic monitoring network on the global seafloor". Seismological Research Letters. 91 (3): 1343–1355. doi:10.1785/0220190123. Unknown parameter |s2cid= ignored (help)
  14. ↑ Hammond, James O S; England, Richard; Rawlinson, Nick; Curtis, Andrew; Sigloch, Karin; Harmon, Nick; Baptie, Brian (2019). "The future of passive seismic acquisition". Astronomy & Geophysics. 60 (2): 2.37–2.42. doi:10.1093/astrogeo/atz102.
  15. ↑ Romanowic, Barbara; Giardini, Domenico (2001). "The Future of Permanent Seismic Networks". Science. 293 (5537): 2000–2001. doi:10.1126/science.1061771. PMID 11557863. Unknown parameter |s2cid= ignored (help)
  16. ↑ Simons, Frederik J.; Nolet, Guust; Georgief, Paul; Babcock, Jeff M.; Regier, Lloyd A.; Davis, Russ E. (2009). "On the potential of recording earthquakes for global seismic tomography by low-cost autonomous instruments in the oceans". Journal of Geophysical Research. 114 (B5): B05307. Bibcode:2009JGRB..114.5307S. doi:10.1029/2008jb006088.
  17. ↑ Sukhovich, Alexey; Bonnieux, Sébastien; Hello, Yann; Irisson, Jean-Olivier; Simons, Frederik J.; Nolet, Guust (2015). "Seismic monitoring in the oceans by autonomous floats". Nature Communications. 6 (1): 8027. Bibcode:2015NatCo...6.8027S. doi:10.1038/ncomms9027. PMC 4560755. PMID 26289598.
  18. ↑ Himmelstein, Sue (2019-02-10). "Monitoring marine earthquakes with MERMAIDs". Electronics360.CS1 maint: Date and year (link)
  19. ↑ Nolet, Guust; Hello, Yann; Lee, Suzan van der; Bonnieux, Sébastien; Ruiz, Mario C.; Pazmino, Nelson A.; Deschamps, Anne; Regnier, Marc M.; Font, Yvonne; Chen, Yongshun J.; Simons, Frederik J. (2019). "Imaging the Galápagos mantle plume with an unconventional application of floating seismometers". Scientific Reports. 9 (1): 1326. Bibcode:2019NatSR...9.1326N. doi:10.1038/s41598-018-36835-w. PMC 6362208. PMID 30718618.
  20. ↑ Walker, Robin (2019-02-06). "MERMAIDs spy huge umbrella-shaped heat source beneath the Galápagos". Forbes.com.CS1 maint: Date and year (link)
  21. ↑ Simon, Joel; Simons, Frederik J; Irving, Jessica C. E. (2022). "Recording earthquakes for tomographic imaging of the mantle beneath the South Pacific by autonomous MERMAID floats". Geophysical Journal International. 228 (1): 147170. doi:10.1093/gji/ggab271.
  22. ↑ Tepp, Gabrielle; Dziak, Robert P. (2021). "The seismo‐acoustics of submarine volcanic eruptions". Journal of Geophysical Research. 126 (4): e2020JB020912. Bibcode:2021JGRB..12620912T. doi:10.1029/2020JB020912. Unknown parameter |s2cid= ignored (help)
  23. ↑ Pipatprathanporn, Sirawich; Simons, Frederik J (2022). "One year of sound recorded by a MERMAID float in the Pacific: hydroacoustic earthquake signals and infrasonic ambient noise". Geophysical Journal International. 228 (1): 193–212. doi:10.1093/gji/ggab296.
  24. ↑ Joubert, Cécile; Nolet, Guust; Bonnieux, Sébastien; Deschamps, Anne; Dessa, Jean-Xavier; Hello, Yann (2016). "P‐Delays from floating seismometers (MERMAID), Part I: Data processing". Seismological Research Letters. 87 (1): 73–80. doi:10.1785/0220150111.
  25. ↑ "MERMAID Data now available through the IRIS DMC". IRIS Data Services Newsletter. 23 (2). Summer 2021. Retrieved 15 October 2021.
  26. ↑ Sukhovich, Alexey; Irisson, Jean‐Olivier; Simons, Frederik J.; Ogé, Anthony; Hello, Yann; Deschamps, Anne; Nolet, Guust (2011). "Automatic discrimination of underwater acoustic signals generated by teleseismic P‐waves: A probabilistic approach". Geophysical Research Letters. 38 (18): L18605. Bibcode:2011GeoRL..3818605S. doi:10.1029/2011GL048474.
  27. ↑ Simon, Joel; Simons, Frederik J (2021). "A MERMAID miscellany: Seismoacoustic signals beyond the P wave". Seismological Research Letters. 92 (6): 3657–3667. doi:10.1785/0220210052. Unknown parameter |s2cid= ignored (help)
  28. ↑ Bigot‐Cormier, F.; Berenguer, J.‐L. (2017). "How students can experience science and become researchers: Tracking MERMAID floats in the oceans". Seismological Research Letters. 88 (2A): 416–420. doi:10.1785/0220160121.

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