CPT-based analysis of liquefaction and re-liquefaction following the Canterbury earthquake sequence

Lees, JJ; Ballagh, RH; Orense, Rolando P.; Ballegooy, Sjoerd van

doi:10.1016/j.soildyn.2015.02.004

Cited by 29 publications

(10 citation statements)

References 12 publications

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“…Monitoring wells were not consistently in the near or intermediate field for the data set and thus were subject to variable shaking intensities. Furthermore, aquifer susceptibility to earthquake‐induced process may have changed with each successive earthquake (Elkhoury et al, ; Xue et al, ), although there does not appear to be any significant change in ground strength following the Canterbury earthquake sequence (Lees et al, ; Orense et al, ).…”

Section: Discussionmentioning

confidence: 99%

Tidal Behavior and Water‐Level Changes in Gravel Aquifers in Response to Multiple Earthquakes: A Case Study From New Zealand

Weaver

Doan

Cox

et al. 2019

Water Resources Research

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Earthquakes have been inferred to induce hydrological changes in aquifers on the basis of either changes to well water-levels or tidal behavior, but the relationship between these changes remains unclear. Here, changes in tidal behavior and water-levels are quantified using a hydrological network monitoring gravel aquifers in Canterbury, New Zealand, in response to nine earthquakes (of magnitudes M w 5.4 to 7.8) that occurred between 2008 and 2015. Of the 161 wells analyzed, only 35 contain water-level fluctuations associated with "Earth + Ocean" (7) or "Ocean" (28) tides. Permeability reduction manifest as changes in tidal behavior and increased water-levels in the near field of the Canterbury earthquake sequence of 2010-2011 support the hypothesis of shear-induced consolidation. However, tidal behavior and water-level changes rarely occurred simultaneously (~2%). Water-level changes that occurred with no change in tidal behavior reequilibrated at a new postseismic level more quickly (on timescales of~50 min) than when a change in tidal behavior occurred (~240 min to 10 days). Water-level changes were more than likely to occur above a peak dynamic stress of~50 kPa and were more than likely to not occur below 10 kPa. The minimum peak dynamic stress required for a tidal behavior change to occur was~0.2 to 100 kPa.

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Section: Discussionmentioning

confidence: 99%

Tidal Behavior and Water‐Level Changes in Gravel Aquifers in Response to Multiple Earthquakes: A Case Study From New Zealand

Weaver

Doan

Cox

et al. 2019

Water Resources Research

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show abstract

“…Monitoring wells were not consistently in the near or intermediate field for the data set and thus were subject to variable shaking intensities. Furthermore, aquifer susceptibility to earthquake-induced process may have changed with each successive earthquake (Elkhoury et al, 2006;Xue et al, 2013), although there does not appear to be any significant change in ground strength following the Canterbury earthquake sequence (Lees et al, 2015;Orense et al, 2012).…”

Section: Comparison Of Tidal Behavior and Water-level Changesmentioning

confidence: 99%

Tidal Behavior and Water-Level Changes in Gravel Aquifers in Response to Multiple Earthquakes: A Case Study From New Zealand

Weaver¹,

Doan²,

Cox³

et al. 2021

Preprint

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©2019. American Geophysical Union. All Rights Reserved. Earthquakes have been inferred to induce hydrological changes in aquifers on the basis of either changes to well water-levels or tidal behavior, but the relationship between these changes remains unclear. Here, changes in tidal behavior and water-levels are quantified using a hydrological network monitoring gravel aquifers in Canterbury, New Zealand, in response to nine earthquakes (of magnitudes M w 5.4 to 7.8) that occurred between 2008 and 2015. Of the 161 wells analyzed, only 35 contain water-level fluctuations associated with “Earth + Ocean” (7) or “Ocean” (28) tides. Permeability reduction manifest as changes in tidal behavior and increased water-levels in the near field of the Canterbury earthquake sequence of 2010–2011 support the hypothesis of shear-induced consolidation. However, tidal behavior and water-level changes rarely occurred simultaneously (~2%). Water-level changes that occurred with no change in tidal behavior reequilibrated at a new postseismic level more quickly (on timescales of ~50 min) than when a change in tidal behavior occurred (~240 min to 10 days). Water-level changes were more than likely to occur above a peak dynamic stress of ~50 kPa and were more than likely to not occur below ~10 kPa. The minimum peak dynamic stress required for a tidal behavior change to occur was ~0.2 to 100 kPa.

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“…However, the Liquefaction Potential Index (LPI) was used to represent the damage potential at each site and then a comparison of the CPT-based strength profiles obtained before each of the major aftershocks was performed (J.J. Lees, 2015) [18]. It can be observed from the LPI contour maps that a high degree of liquefaction damages is likely to occur at a particular location for higher magnitude of earthquake and peak ground acceleration (Debojit Sarker, 2015) [19].…”

Section: Assessment Of Liquefaction Potential Indexmentioning

confidence: 99%

Development of Soil Distribution and Liquefaction Potential Maps for Downtown Area in Yangon, Myanmar

Tint

Kyaw

2018

CivileJournal

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The problem of soil against liquefaction during earthquakes is devastating geotechnical phenomenon. Soil against liquefaction is generally occurred in loose cohesionless saturated soil when pore water pressure increases suddenly due to earthquakes and shear strength of the soil decreases to zero. Yangon area has been chosen as the study area because it is the most populated and largest city in Myanmar and located in low to medium seismicity region. In this purpose, the liquefaction potential map have been prepared for site planners and decision makers to prevent loss of lives. Geographic Information System (GIS) is very useful in decision making about the area subjected to liquefaction. ArcGIS software is used to develop the liquefaction potential maps of the selected area in Yangon City. To perform in this study, the field borehole data for groundwater table, Standard penetration test (SPT), blow counts, dry density, wet density and fine content, etc. have been collected from the downtown area of this city. Firstly, the safety factor of soil liquefaction is computed by using NCEER (National Center of Earthquake Engineering Research, 1997) Method based on cyclic resistance ratio and cyclic stress ratio and then liquefaction Potential Index (LPI) values are determined using Luna and Frost Method, 1998. Finally, liquefaction potential maps are developed corresponding to the ground motions for annual probability of exceedance equal to 1%, 2% and 10% in 50 years.

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CPT-based analysis of liquefaction and re-liquefaction following the Canterbury earthquake sequence

Cited by 29 publications

References 12 publications

Tidal Behavior and Water‐Level Changes in Gravel Aquifers in Response to Multiple Earthquakes: A Case Study From New Zealand

Tidal Behavior and Water‐Level Changes in Gravel Aquifers in Response to Multiple Earthquakes: A Case Study From New Zealand

Tidal Behavior and Water-Level Changes in Gravel Aquifers in Response to Multiple Earthquakes: A Case Study From New Zealand

Development of Soil Distribution and Liquefaction Potential Maps for Downtown Area in Yangon, Myanmar

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