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Kinoshita, Chihiro; Saffer, Demian M; Kopf, Achim J; Roesner, Alexander; Wallace, L M; Araki, Eiichiro; Kimura, Toshinori; Machida, Shiki; Kobayashi, R; Davis, Earl; Toczko, Sean; Carr, Stephanie A: 5.3 year time series of formation pore fluid pressure and temperature from IODP Hole 319-C0010A measured by GeniusPlug from 2010 to 2016 [dataset publication series]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.901050 (dataset in review), Supplement to: Kinoshita, C et al. (2018): Changes in Physical Properties of the Nankai Trough Megasplay Fault Induced by Earthquakes, Detected by Continuous Pressure Monitoring. Journal of Geophysical Research: Solid Earth, 123(2), 1072-1088, https://doi.org/10.1002/2017JB014924

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Abstract:
One primary objective of Integrated Ocean Drilling Program Expedition 365, conducted as part of the Nankai Trough Seismogenic Zone Experiment, was to recover a temporary observatory emplaced to monitor formation pore fluid pressure and temperature within a splay fault in the Nankai subduction zone offshore SW Honshu, Japan. Here we use a 5.3 year time series of formation pore fluid pressure, and in particular the response to ocean tidal loading, to evaluate changes in pore pressure and formation and fluid elastic properties induced by earthquakes. Our analysis reveals 31 earthquake‐induced perturbations. These are dominantly characterized by small transient increases in pressure (28 events) and decreases in ocean tidal loading efficiency (14 events) that reflect changes to formation or fluid compressibility. The observed perturbations follow a magnitude‐distance threshold similar to that reported for earthquake‐driven hydrological effects in other settings. To explore the mechanisms that cause these changes, we evaluate the expected static and dynamic strains from each earthquake. The expected static strains are too small to explain the observed pressure changes. In contrast, estimated dynamic strains correlate with the magnitude of changes in both pressure and loading efficiency. We propose potential mechanism for the changes and subsequent recovery, which is exsolution of dissolved gas in interstitial fluids in response to shaking.
Keyword(s):
Continuous Pressure Monitoring IODP365 C0010; Megasplay Fault Induced by Earthquakes; Nankai Trough; Physical properties
Related to:
Araki, Eiichiro; Saffer, Demian M; Kopf, Achim J; Wallace, L M; Kimura, Toshinori; Machida, Shiki; Ide, Satoshi; Davis, Earl; IODP Expedition 365 shipboard scientists (2017): Recurring and triggered slow-slip events near the trench at the Nankai Trough subduction megathrust. Science, 356(6343), 1157-1160, https://doi.org/10.1126/science.aan3120
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Coverage:
Latitude: 33.209968 * Longitude: 136.686540
Date/Time Start: 2010-11-06T01:12:30 * Date/Time End: 2016-04-03T11:34:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Size:
7 datasets

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Datasets listed in this publication series

  1. Kinoshita, C; Saffer, DM; Kopf, AJ et al. (in review): Time series of formation pore fluid pressure and temperature from IODP Hole 319-C0010A measured by GeniusPlug in 2010. https://doi.pangaea.de/10.1594/PANGAEA.900994
  2. Kinoshita, C; Saffer, DM; Kopf, AJ et al. (in review): Time series of formation pore fluid pressure and temperature from IODP Hole 319-C0010A measured by GeniusPlug in 2011. https://doi.pangaea.de/10.1594/PANGAEA.901017
  3. Kinoshita, C; Saffer, DM; Kopf, AJ et al. (in review): Time series of formation pore fluid pressure and temperature from IODP Hole 319-C0010A measured by GeniusPlug in 2012. https://doi.pangaea.de/10.1594/PANGAEA.901023
  4. Kinoshita, C; Saffer, DM; Kopf, AJ et al. (in review): Time series of formation pore fluid pressure and temperature from IODP Hole 319-C0010A measured by GeniusPlug in 2013. https://doi.pangaea.de/10.1594/PANGAEA.901025
  5. Kinoshita, C; Saffer, DM; Kopf, AJ et al. (in review): Time series of formation pore fluid pressure and temperature from IODP Hole 319-C0010A measured by GeniusPlug in 2014. https://doi.pangaea.de/10.1594/PANGAEA.901026
  6. Kinoshita, C; Saffer, DM; Kopf, AJ et al. (in review): Time series of formation pore fluid pressure and temperature from IODP Hole 319-C0010A measured by GeniusPlug in 2015. https://doi.pangaea.de/10.1594/PANGAEA.901027
  7. Kinoshita, C; Saffer, DM; Kopf, AJ et al. (in review): Time series of formation pore fluid pressure and temperature from IODP Hole 319-C0010A measured by GeniusPlug in 2016. https://doi.pangaea.de/10.1594/PANGAEA.901048