Linear poroelasticity of groundwater levels from observational records at wells in Hokkaido, Japan

Shibata, Tomo; Matsumoto, Norio; Akita, Fujio; Okazaki, Noritoshi; Takahashi, Hiroaki; Ikeda, Ryuji

doi:10.1016/j.tecto.2009.10.025

Cited by 10 publications

(8 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Abrupt changes in well water levels in the nearfield (within 1-2 fault lengths) are often explained by the static poroelastic strain of aquifers caused by earthquakes (Akita and Matsumoto, 2004;Matsumoto and Roeloffs, 2003;Roeloffs and Bredehoeft, 1985;Shi et al, 2012;Shibata et al, 2010;Wakita, 1975;Wang and Chia, 2008;Zhang and Huang, 2011). In the intermediate and farfield (many fault lengths), the static poroelastic strains from displacement during earthquakes are small and can fail to explain the sign of the sustained variations in water levels .…”

Section: Introductionmentioning

confidence: 99%

Tidal response variation and recovery following the Wenchuan earthquake from water level data of multiple wells in the nearfield

Lai

Xue

et al. 2014

Tectonophysics

View full text Add to dashboard Cite

An important dataset to emerge from the Wenchuan earthquake Fault Scientific Drilling project is direct measurement of the permeability evolution of a fault zone. In order to provide context for this new observation, we examined the evolution of tidal responses in the nearfield region (within~1.5 fault lengths) at the time of the mainshock. Previous work has shown that seismic waves can increase permeability in the farfield, but their effects in the nearfield are more difficult to discern. Close to an earthquake, hydrogeological responses are generally a combination of static and dynamic stresses. In this work, we examine the well water level data in the region of the large M w 7.9 Wenchuan earthquake and use the phase shift of tidal responses as a proxy for the permeability variations over time. We then compare the results with the coseismic water level pattern in order to separate out the dynamic and static effects. The coseismic water level pattern for observed steps coincident with the Wenchuan mainshock mainly tracks the expected static stress field. However, most of the wells that have resolvable tidal responses show permeability enhancement after this large earthquake regardless of whether the coseismic response for the well water level is increasing or decreasing, indicating permeability enhancement is a distinct process from static poroelastic strain.

show abstract

Section: Introductionmentioning

confidence: 99%

Tidal response variation and recovery following the Wenchuan earthquake from water level data of multiple wells in the nearfield

Lai

Xue

et al. 2014

Tectonophysics

View full text Add to dashboard Cite

show abstract

“…Roeloffs, 1996;Jonsson et al, 2003;Shibata et al, 2010) or crustal spreading, as observed at the Juan de Fuca Ridge (Davis et al, 2001).…”

mentioning

confidence: 97%

Poroelastic responses of confined aquifers to subsurface strain and their use for volcano monitoring

2015

View full text Add to dashboard Cite

Abstract. Well water level changes associated with magmatic unrest can be interpreted as a result of pore pressure changes in the aquifer due to crustal deformation, and so could provide constraints on the subsurface processes causing this strain. We use finite element analysis to demonstrate the response of aquifers to volumetric strain induced by pressurized magma reservoirs. Two different aquifers are invoked -an unconsolidated pyroclastic deposit and a vesicular lava flow -and embedded in an impermeable crust, overlying a magma chamber. The time-dependent, fully coupled models simulate crustal deformation accompanying chamber pressurization and the resulting hydraulic head changes as well as flow through the porous aquifer, i.e. porous flow. The simulated strain leads to centimetres (pyroclastic aquifer) to metres (lava flow aquifer) of hydraulic head changes; both strain and hydraulic head change with time due to substantial porous flow in the hydrological system.Well level changes are particularly sensitive to chamber volume, shape and pressurization strength, followed by aquifer permeability and the phase of the pore fluid. The depths of chamber and aquifer, as well as the aquifer's Young's modulus also have significant influence on the hydraulic head signal. While source characteristics, the distance between chamber and aquifer and the elastic stratigraphy determine the strain field and its partitioning, flow and coupling parameters define how the aquifer responds to this strain and how signals change with time.We find that generic analytical models can fail to capture the complex pre-eruptive subsurface mechanics leading to strain-induced well level changes, due to aquifer pressure changes being sensitive to chamber shape and lithological heterogeneities. In addition, the presence of a pore fluid and its flow have a significant influence on the strain signal in the aquifer and are commonly neglected in analytical models. These findings highlight the need for numerical models for the interpretation of observed well level signals. However, simulated water table changes do indeed mirror volumetric strain, and wells are therefore a valuable addition to monitoring systems that could provide important insights into preeruptive dynamics.

show abstract

“…The observed coseismic change of wells JNS and KTB are 4.4 and 5.0 times larger than the corresponding estimated changes, respectively (Table 4). Coseismic changes associated with past seismic events are also reported for wells ABT, JNS, KTB, and YCG, and related to the 2003 Tokachi-Oki and the 2004 Kushiro-Oki earthquakes (Akita and Matsumoto 2004;Shibata et al 2010). These past coseismic changes can be compared with those related to the 2018 Hokkaido Eastern Iburi earthquake (Table 4).…”

Section: Coseismic Changes In Groundwater Levelmentioning

confidence: 92%

“…Coseismic changes in groundwater heads have been extensively studied elsewhere (i.e., Roeloffs 1996;Quilty and Roeloffs 1997;Akita andMatsumoto 2001, 2004;Kitagawa et al 2006;Kinoshita et al 2015). These changes are occasionally recognized as reflecting the poroelastic response to the seismic events, but do not correlate with the coseismic volumetric strain changes in many cases (Koizumi et al 1996;Itaba et al 2008;Shi et al 2015).…”

Section: Coseismic Changes In Groundwater Levelmentioning

confidence: 99%

“…Numerous case studies describe changes in groundwater level in boreholes and wells associated with earthquakes (e.g., Igarashi and Wakita 1991;Roeloffs 1996;Quilty and Roeloffs 1997;Akita andMatsumoto 2001, 2004;Manga and Wang 2007). These changes can be explained by several processes, such as the response of pore pressure to coseismic strain changes (Wakita 1975;Muir-Wood and King 1993), changes in permeability due to seismic waves (Rojstaczer et al 1995;Wang et al 2004;Elkhoury et al 2006;Kinoshita et al 2015), and fluid and gas movements in cracks or crustal fractures (Sibson and Rowland 2003;Matsumoto and Roeloffs 2003).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coseismic changes in groundwater level during the 2018 Hokkaido Eastern Iburi earthquake

Shibata

Takahashi

et al. 2020

Earth Planets Space

Self Cite

View full text Add to dashboard Cite

Six wells were continuously monitored in Hokkaido, northern Japan, to relate groundwater level changes to regional seismic activity. Groundwater level changes following the 2018 Hokkaido Eastern Iburi earthquake were detected in three of the six wells, even though they are located hundreds of kilometers from the epicenter. The groundwater level changes are qualitatively consistent with the volumetric strain induced by the earthquake. We analyzed groundwater level responses to the M 2 tidal constituent before and after the earthquake, but related changes in amplitude and phase shifts remained within the usual variation. Observed coseismic change was explained by the response to the M 2 tidal constituent component and the calculated volumetric strain for one of the wells, where groundwater level decreased. The observed change in the other two was found to be much greater than the corresponding estimates of the volumetric strain.

show abstract

Linear poroelasticity of groundwater levels from observational records at wells in Hokkaido, Japan

Cited by 10 publications

References 12 publications

Tidal response variation and recovery following the Wenchuan earthquake from water level data of multiple wells in the nearfield

Tidal response variation and recovery following the Wenchuan earthquake from water level data of multiple wells in the nearfield

Poroelastic responses of confined aquifers to subsurface strain and their use for volcano monitoring

Coseismic changes in groundwater level during the 2018 Hokkaido Eastern Iburi earthquake

Contact Info

Product

Resources

About