scholarly journals Groundwater level changes on Jeju Island associated with the Kumamoto and Gyeongju earthquakes

2017 ◽  
Author(s):  
Soo-Hyoung Lee ◽  
Yoon-Suk Park ◽  
Kyoochul Ha ◽  
YongCheol Kim ◽  
Sung-Wook Kim ◽  
...  
Keyword(s):  
Local Time ◽  
Groundwater Level ◽  
Korean Peninsula ◽  
Jeju Island ◽  
Japanese Island ◽  
Initial Water ◽  
Kumamoto Earthquake ◽  
Level Change ◽  
Gyeongju Earthquake ◽  
Groundwater Level Changes

Abstract. The largest earthquake since the beginning of instrumental earthquake monitoring (magnitude 5.4) in Korean peninsula occurred in Gyeongju City area, South Korea, at 20:32:54 on September 12, 2016 (local time). Before the Gyeongju earthquake, an earthquake of magnitude 7.0 occurred in Kumamoto prefecture, Kyushu, Japan, at 01:25:06 on April 16, 2016 (local time). This study examined groundwater level changes of the monitoring wells on Jeju Island in relation to the Gyeongju and Kumamoto earthquakes. Groundwater level changes due to the Kumamoto and Gyeongju earthquakes exhibited spikes or oscillations, with the initial water level change occurring 2–3 min after earthquake generation, displaying different behaviors depending on the magnitude of the earthquakes and different sensitivities depending on the aquifer and geological characteristics. On Jeju Island, the groundwater level change caused by the Gyeongju earthquake (M 5.4) was larger than that caused by the Kumamoto earthquake (M 5.4). This was because a smaller energy attenuation occurred during the Gyeongju earthquake along the Yangsan fault on the Korean peninsula extending in the NNE-SSW direction, while a larger energy attenuation occurred during the Kumamoto earthquake along the median tectonic line (MTL) fault on the Japanese island arc extending in the ENE-WSW direction.

scholarly journals Analysis of Groundwater Level Changes Due to Earthquake in Jeju Island (For the Indonesian Earthquake with Magnitude 7.7 in 2010)

2011 ◽  
Vol 16 (2) ◽  
pp. 41-51 ◽  
Author(s):  
Soo-Hyoung Lee ◽  
Se-Yeong Hamm ◽  
Kyoo-Chul Ha ◽  
Yong-Cheol Kim ◽  
Beom-Keun Cheong ◽  
...  
Keyword(s):  
Groundwater Level ◽  
Jeju Island ◽  
Groundwater Level Changes

scholarly journals Groundwater level changes on Jeju Island associated with the Kumamoto and Gyeongju earthquakes

2017 ◽  
Vol 8 (2) ◽  
pp. 1783-1791 ◽  
Author(s):  
Soo-Hyoung Lee ◽  
Jae-Yeol Cheong ◽  
Yoon-Suk Park ◽  
Kyoochul Ha ◽  
YongCheol Kim ◽  
...  
Keyword(s):  
Groundwater Level ◽  
Jeju Island ◽  
Groundwater Level Changes

Different responses of groundwater level changes through hydrogeological characteristics due to M5.4 Pohang earthquake

2020 ◽  
Author(s):  
Soo-Hyoung Lee ◽  
Jae Min Lee ◽  
Heesung Yoon ◽  
Yongje Kim
Keyword(s):  
Groundwater Level ◽  
Hydraulic Properties ◽  
Seismic Waves ◽  
Observation Well ◽  
Monitoring Wells ◽  
Level Change ◽  
Hydrogeological Characteristics ◽  
Pass Through ◽  
Groundwater Level Change ◽  
Groundwater Level Changes

<p>Earthquake of magnitude M5.4 the second largest recorded earthquake occurred in Pohang, South Korea at 05:29:32 (UTC time) on November 15, 2017. The M5.4 event and hundreds of aftershocks produced extreme impacts across the area to date along with human and property damages. The distance between the epicenter of the M5.4 Pohang earthquake and the groundwater observation well is about 43 km for KJ-well and about 76 km for YS-well. Records from these two monitoring wells showed groundwater level changes occurred in 2017-11-15 05:30 (UTC time), about 30 seconds after the earthquake. In KJ-well, 8.0 cm of groundwater level change was observed, and in YS-well, about 30.0 cm of groundwater level change. The changes in groundwater level appeared to be a spike-like pattern that rises immediately due to the compressive action of the aquifer as the seismic waves pass through and then return to its original state. Interestingly, the groundwater level changes in YS-well was observed to be approximately three times greater than KJ-well although YS-well is approximately twice as far from the epicenter as KJ-well. The factors causing these different changes were compared and analyzed for the geometry, hydraulic properties, and geological characteristics of the well locations</p>

scholarly journals Development of the Groundwater Level Changes Detector for Earthquake Prediction at Yogyakarta Region – Indonesia

2018 ◽  
Vol 218 ◽  
pp. 02010
Author(s):  
Herlambang Laksamana Firdaus ◽  
Sunarno ◽  
Memory Motivanisman Waruwu ◽  
Rony Wijaya
Keyword(s):  
Data Storage ◽  
Earthquake Prediction ◽  
Groundwater Level ◽  
Electrical Power ◽  
Earthquake Precursors ◽  
Level Change ◽  
Storage Media ◽  
Change System ◽  
Groundwater Level Change ◽  
Groundwater Level Changes

Groundwater level (GWL) change is one of the earthquake precursors that used for earthquake prediction. The groundwater level change system detector for earthquake prediction at Yogyakarta region - Indonesia contains the GWL detector, signal conditioner, controller, data storage and electrical power supply. The GWL changes detectors which are developed in this report are expected to be used for the earthquake precursors prediction in Yogyakarta region - Indonesia. The detector system shows the detection of groundwater level changes with a sensitivity of 0.01 centimeters. The data from the detector is stored on the storage media, then the data which are collected in weekly will be confirmed with the earthquake data from the BMKG (Indonesian Meteorology, Climatology, and Geophysics Agency). On June 11, 12, 15, and 21 the GWL have a change of 4 centimeters to 19 centimeters respectively, the earthquake occurs within the next 2 days. It shows that the system could be used as an earthquake precursors monitoring system based on GWL changes. This report in order to give the valuable information of the development system that can be used for earthquake prediction, even though it needs further study and development of the instrumentation system from other earthquake precursors anomaly.

scholarly journals Seasonal and transient surface displacements in the Kumamoto area, Japan, associated with the 2016 Kumamoto earthquake: implications for seismic-induced groundwater level change

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Kazuya Ishitsuka ◽  
Takeshi Tsuji ◽  
Weiren Lin ◽  
Makoto Kagabu ◽  
Jun Shimada
Keyword(s):  
Groundwater Level ◽  
Surface Displacement ◽  
Earthquake Sequence ◽  
2016 Kumamoto Earthquake ◽  
Persistent Scatterer Interferometry ◽  
Kumamoto Earthquake ◽  
Level Change ◽  
Surface Displacements ◽  
The 2016 Kumamoto Earthquake ◽  
Groundwater Level Change

Abstract The 2016 Kumamoto earthquake sequence on April 14 (Mw 6.2) and April 16 (Mw 7.0) altered the regional groundwater level. To better understand the relationship between groundwater level change and surface displacement, we estimated surface displacement in the Kumamoto area (Japan) using persistent scatterer interferometry from 19 ALOS/PALSAR images acquired between January 7, 2007 and March 5, 2011, 28 ALOS-2/PALSAR-2 images acquired between April 17, 2016 and December 10, 2018, and 113 Sentinel-1 images acquired between May 26, 2016 and December 30, 2018. Our estimation shows that transient surface displacement occurred following the 2016 Kumamoto earthquake sequence, together with seasonal surface displacement that was not detected from the 2007–2011 images. We suggest that a portion of the transient displacement occurred via groundwater drawdown through new ruptures that formed owing to the 2016 Kumamoto earthquake sequence and sediment compaction. Seasonal surface displacements detected after the 2016 Kumamoto earthquake sequence are linked to groundwater level variations.

scholarly journals Seismically induced changes in groundwater levels and temperatures following the ML5.8 (ML5.1) Gyeongju earthquake in South Korea

2021 ◽  
Author(s):  
Soo-Hyoung Lee ◽  
Jae Min Lee ◽  
Sang-Ho Moon ◽  
Kyoochul Ha ◽  
Yongcheol Kim ◽  
...  
Keyword(s):  
South Korea ◽  
Groundwater Level ◽  
Seismic Waves ◽  
Groundwater Resources ◽  
Fluid Pressure ◽  
Water Levels ◽  
Aquifer System ◽  
Groundwater Levels ◽  
Monitoring Wells ◽  
Gyeongju Earthquake

AbstractHydrogeological responses to earthquakes such as changes in groundwater level, temperature, and chemistry, have been observed for several decades. This study examines behavior associated with ML 5.8 and ML 5.1 earthquakes that occurred on 12 September 2016 near Gyeongju, a city located on the southeast coast of the Korean peninsula. The ML 5.8 event stands as the largest recorded earthquake in South Korea since the advent of modern recording systems. There was considerable damage associated with the earthquakes and many aftershocks. Records from monitoring wells located about 135 km west of the epicenter displayed various patterns of change in both water level and temperature. There were transient-type, step-like-type (up and down), and persistent-type (rise and fall) changes in water levels. The water temperature changes were of transient, shift-change, and tendency-change types. Transient changes in the groundwater level and temperature were particularly well developed in monitoring wells installed along a major boundary fault that bisected the study area. These changes were interpreted as representing an aquifer system deformed by seismic waves. The various patterns in groundwater level and temperature, therefore, suggested that seismic waves impacted the fractured units through the reactivation of fractures, joints, and microcracks, which resulted from a pulse in fluid pressure. This study points to the value of long-term monitoring efforts, which in this case were able to provide detailed information needed to manage the groundwater resources in areas potentially affected by further earthquakes.

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