Kopf, Achim et al. (2010): The Smartplug and GeniusPlug; simple retrievable observatory systems for NanTroSEIZE borehole monitoring

Leg/Site/Hole:
IODP 319
IODP 332
IODP 319 C0010
IODP 332 C0010
Identifier:
2012-018515
georefid

10.2204/iodp.proc.332.105.2011
doi

Creator:
Kopf, Achim
University of Bremen, MARUM Research Centre, Bremen, Germany
author

Saffer, Demian M.
Japan Agency for Marine-Earth Science and Technology, Japan
author

Davis, Earl E.
Pennsylvania State University, United States
author

Hammerschmidt, Sebastian
University of Alaska-Fairbanks, United States
author

LaBonte, Alison
Pennsylvania State University, United States
author

Meldrum, Robert
Pacific Geoscience Centre, Canada
author

Toczko, Sean
Monterey Bay Aquarium Research Institute, United States
author

Lauer, Rachel
University of Southern California, United States
author

Heesemann, Martin
Aarhus University, Denmark
author

Macdonald, Robert
author

Wheat, C. Geoffrey
author

Jannasch, Hans W.
author

Edwards, Katrina
author

Orcutt, Beth
author

Haddad, Amanda
author

Villinger, Heinrich
author

Araki, Eiichiro
author

Kitada, Kazuya
author

Kimura, Toshinori
author

Kido, Yukari
author

Kinoshita, Masataka
author

Tobin, Harold
author

Identification:
The Smartplug and GeniusPlug; simple retrievable observatory systems for NanTroSEIZE borehole monitoring
2010
In: Kopf, Achim, Araki, Eiichiro, Toczko, Sean, Kido, Yukari, Hammerschmidt, Sebastian, Kimura, Toshinori, Kitada, Kazuya, Lauer, Rachel, Saffer, Demian M., Wheat, C. Geoffrey, 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
IODP Management International, Washington, DC, United States
332
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., approximately 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 approximately 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).
Coverage:Geographic coordinates:
North:33.1236
West:136.4112East: 136.4112
South:33.1236

Seismology; Asia; boreholes; continental margin; earthquakes; Expedition 319; Expedition 332; Far East; faults; geologic hazards; Honshu; instruments; Integrated Ocean Drilling Program; IODP Site C0010; Japan; Kii Peninsula; marine methods; microseisms; monitoring; Nankai Trough; NanTroSEIZE; natural hazards; North Pacific; Northwest Pacific; observatories; Pacific Ocean; pore pressure; subduction zones; tsunamis; West Pacific;

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