The Smartplug and GeniusPlug; simple retrievable observatory systems for NanTroSEIZE borehole monitoring

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doi: 10.2204/iodp.proc.332.105.2011
Author(s): Kopf, Achim; Saffer, Demian M.; Davis, Earl E.; Hammerschmidt, Sebastian; LaBonte, Alison; Meldrum, Robert; Toczko, Sean; Lauer, Rachel; Heesemann, Martin; Macdonald, Robert; Wheat, C. Geoffrey; Jannasch, Hans W.; Edwards, Katrina; Orcutt, Beth; Haddad, Amanda; Villinger, Heinrich; Araki, Eiichiro; Kitada, Kazuya; Kimura, Toshinori; Kido, Yukari; Kinoshita, Masataka; Tobin, Harold
Integrated Ocean Drilling Program, Expedition 332 Scientists, College Station, TX
Author Affiliation(s): Primary:
University of Bremen, MARUM Research Centre, Bremen, Germany
Other:
Japan Agency for Marine-Earth Science and Technology, Japan
Pennsylvania State University, United States
University of Alaska-Fairbanks, United States
Pacific Geoscience Centre, Canada
Monterey Bay Aquarium Research Institute, United States
University of Southern California, United States
Aarhus University, Denmark
Volume Title: Proceedings of the Integrated Ocean Drilling Program; NantroSEIZE Stage 2; riserless observatory; Expedition 332 of the riser drilling platform; Shingu, Japan, to Minami-Ise, Japan; Sites C0002 and C0010; 25 October-11 December 2010
Volume Author(s): Kopf, Achim; Araki, Eiichiro; Toczko, Sean; Kido, Yukari; Hammerschmidt, Sebastian; Kimura, Toshinori; Kitada, Kazuya; Lauer, Rachel; Saffer, Demian M.; Wheat, C. Geoffrey
Source: Proceedings of the Integrated Ocean Drilling Program; NantroSEIZE Stage 2; riserless observatory; Expedition 332 of the riser drilling platform; Shingu, Japan, to Minami-Ise, Japan; Sites C0002 and C0010; 25 October-11 December 2010, Achim Kopf, Eiichiro Araki, Sean Toczko, Yukari Kido, Sebastian Hammerschmidt, Toshinori Kimura, Kazuya Kitada, Rachel Lauer, Demian M. Saffer and C. Geoffrey Wheat; Integrated Ocean Drilling Program, Expedition 332 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program (Online), Vol.332, 20p. Publisher: IODP Management International, Washington, DC, United States. ISSN: 1930-1014
Note: In English. 28 refs.; illus., incl. sect., geol. sketch map
Summary: During Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) Stage 2 operations, Integrated Ocean Drilling Program (IODP) Hole C0010A was drilled and cased during IODP Expedition 319 and then subsequently instrumented with a temporary borehole monitoring system (a "SmartPlug"). The SmartPlug was recovered in November 2010 during IODP Expedition 332 and replaced with a "GeniusPlug." Both instruments were mounted beneath a Baker Hughes mechanically set retrievable casing packer. The casing packer was set just above the casing screen that intersects a major out-of-sequence splay fault, which branches off of the primary subduction thrust. The SmartPlug was designed to document ambient conditions and provide proxies for strain and fluid flow related to tectonic and seismic activity within the splay fault. This was achieved by recording formation pressures and temperatures. Two pressure sensors were used (resolution=10 ppb full-scale, i.e., ∼0.7 Pa, equivalent to 0.07 mm of seawater head), one plumbed to the formation via the casing screens below the packer seal and the other to the section of the borehole above the packer seal to record ocean loading signals. Temperature was recorded with a platinum thermometer and by a self-contained miniature temperature logger (MTL) with a resolution of ∼0.5 mK. The second-generation instrument package (i.e., GeniusPlug) consisted of a SmartPlug base unit to which an extension containing an OsmoSampler for fluid geochemistry and a FLOCS (flow-through osmo colonization system) unit for microbiology were added. We report on the design of both instruments, the proof-of-concept after successful deployment of both instruments and recovery of the SmartPlug, and preliminary data from the SmartPlug that documents hydrologic responses to predominantly oceanographic loading and teleseismic earthquakes. Additional data and samples are anticipated in 2012 upon recovery of the GeniusPlug, at which time the GeniusPlug will be replaced by a permanent multisensor, multilevel borehole observatory system that will be connected to the seafloor fiber-optic cable network (Dense Oceanfloor Network System for Earthquakes and Tsunamis).
Year of Publication: 2010
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 19 Geophysics, Seismology; Asia; Boreholes; Continental margin; Earthquakes; Expedition 319; Expedition 332; Far East; Faults; Geologic hazards; Honshu; IODP Site C0010; Instruments; Integrated Ocean Drilling Program; Japan; Kii Peninsula; Marine methods; Microseisms; Monitoring; NanTroSEIZE; Nankai Trough; Natural hazards; North Pacific; Northwest Pacific; Observatories; Pacific Ocean; Pore pressure; Subduction zones; Tsunamis; West Pacific
Coordinates: N331236 N331236 E1364112 E1364112
Record ID: 2012018515
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