Abstract
The Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) is a major long-term drilling project designed to investigate the seismogenic behavior of subduction zone plate boundaries. Integrated Ocean Drilling Program (IODP) Expedition 332 deployed a long-term borehole monitoring system (LTBMS), an advanced Circulation Obviation Retrofit Kit (CORK)-type observatory. The recovery of pressure and temperature data from a temporary observatory (SmartPlug) deployed during IODP Expedition 319 helped prove the SmartPlug concept. The permanent LTBMS was deployed n the upper 1000 m of Site C0002, while the SmartPlug was recovered from Site C0010 and replaced with a more capable "GeniusPlug", incorporating an extension with a geochem-ical sampler and biological experiment to the original SmartPlug design. SmartPlug pressure and temperature data showed signs of transient pressure events. <br><br> doi:<a href="http://dx.doi.org/10.2204/iodp.sd.14.04.2012" target="_blank">10.2204/iodp.sd.14.04.2012</a>
Highlights
The Nankai Trough Seismogenic Zone ExperimentSubduction zones account for the majority of global (NanTroSEIZE) is a major long-term drilling project seismic moment release, and slip along subduction megadesigned to investigate the seismogenic behavior of sub- thrusts generate both damaging earthquakes and tsunamis.duction zone plate boundaries
The drilling permanent LTBMS was deployed n the upper 1000 m of Site program includes a coordinated effort to characterize, C0002, while the SmartPlug was recovered from Site C0010 sample, and instrument the plate boundary system at several and replaced with a more capable “GeniusPlug”, incorporat- locations offshore of the Kii Peninsula (Fig. 1), culminating ing an extension with a geochem-ical sampler and biological in drilling, sampling, and instrumenting the plate boundary experiment to the original SmartPlug design
Major lithologic boundaries as well as the location of the megasplay fault at ~407 mbsf were identified in Logging While Drilling (LWD) data and were used to select a depth interval spanning the fault for placement of the two screened casing joints (Saffer et al, 2010)
Summary
Subduction zones account for the majority of global (NanTroSEIZE) is a major long-term drilling project seismic moment release, and slip along subduction megadesigned to investigate the seismogenic behavior of sub- thrusts generate both damaging earthquakes and tsunamis. Integrated Ocean Drilling Understanding the processes that govern the distribution, Program (IODP) Expedition 332 deployed a long-term mechanics, and style of slip along subduction and other borehole monitoring system (LTBMS), an advanced plate boundary fault systems is essential to earthquake. The recovery of pressure and temperature data from a tem- multi-expedition, multistage IODP drilling project focused porary observatory (SmartPlug) deployed during IODP on understanding the mechanics of subduction plate. SmartPlug fault system near the updip limit of inferred coseismic slip, pressure and temperature data showed signs of transient at 5~7 km below sea-floor (Fig. 2; Tobin and Kinoshita, 2006).
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