Study on spatio-temporal characteristics of earthquakes in southwest China based on <i>z</i>-value

Cao, Ziyi; Wang, Yaxiang; Zhang, Heng; Liu, Yan; Liu, Shan; Yin, Lirong; Zheng, Wenfeng

doi:10.1515/geo-2022-0345

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…The level of decreasing in seismicity rate is expressed by the z-value [12]. Several studies have been conducted on the rate of seismicity in a region, including in Southwestern China [13], Eastern Turkey [14], Sakhalin [15], the Japanese subduction zone [16], and California [10]. These studies show a period of quiescence with a duration of several months to several years before a large earthquake occurs.…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Variation Seismicity Pattern in East Java Between 2002 and 2022 Based on the b-value and Seismic Quiescence z-value

Hisyam,

Susilo,

Anshori

et al. 2024

Trends Sci

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East Java is one of the seismically active regions in part of the Sunda Arc whose seismicity pattern must be studied. Therefore, a spatio-temporal analysis of seismicity between 2002 - 2022 in East Java has been conducted. This analysis aims to investigate the seismotectonic conditions in the East Java region over the last twenty years, especially the seismicity patterns associated with significant earthquakes in East Java. The analysis was carried out by quantifying the spatial and temporal variations of seismicity parameters using b-value and z-value. The used data used are earthquake data from the USGS earthquake catalog during 2002 - 2022 in the East Java region. The analysis was performed using the ZMAP 6.0 program code using the maximum likelihood method. The results of the temporal analysis of b-values show that almost all significant earthquakes in East Java were characterized by a decrease in b-values of up to 0.2. Spatially, the significant earthquake on 10 April 2021 was associated with a low b-value (0.9). Temporal z-value analysis shows that the significant East Java earthquake was preceded by a quiet period (positive z-value) between 4 - 5 years (2003 - 2008 and 2012 - 2016). Spatial analysis of the z-value in the last 7 shows an increase in the z-value before the significant earthquakes occurred on 16 July 2019, 18 March 2020, and 10 April 2021. Therefore, the results of this study indicate that the b-value and z-value potentially can be used as precursors of the significant East Java earthquake. HIGHLIGHTS This is the first time a correlation of b-value and z-value as seismicity parameters has been carried out in East Java, Indonesia, as an attempt to determine the significant earthquake precursors The significant earthquakes in East Java during 2002 - 2022 were marked by a decrease in b-value of up to 0.2 The quiet period in East Java lasted between 4 - 7 years, i.e. 2002 - 2009 and 2012 - 2016, characterized by a positive z-value peaked until +3.5 The z-value at the location of a significant earthquake epicenters show a positive value 2 - 3 years prior to the main quake GRAPHICAL ABSTRACT

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Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Variation Seismicity Pattern in East Java Between 2002 and 2022 Based on the b-value and Seismic Quiescence z-value

Hisyam,

Susilo,

Anshori

et al. 2024

Trends Sci

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Seismic response analysis of the underground cavern group at the Yingliangbao hydropower station to the 2022 Ms 6.8 Luding earthquake

Cao,

Zheng,

Jiang

et al. 2024

Soil Dynamics and Earthquake Engineering

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Impact of dam construction on precipitation: a regional perspective

et al. 2022

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Context Numerous dams have been built in China to develop hydropower, a sustainable and clean energy source. In recent years, the impact of dam construction on the regional climate has gradually attracted the attention of researchers. Aims This study has evaluated the impact of large-scale dam construction on regional precipitation. Methods This paper used the precipitation data of more than 2400 national stations of the China National Meteorological Information Center from 1990 to 2012. The regional precipitation data before and after the construction of the Xiaolangdi Dam and the Three Gorges Dam on the Yangtze River were analysed using geostatistical tools. Wavelet transform and Yamamoto signal-to-noise ratio analysis were further adopted. Key results Analysis of the variation points of precipitation characteristics confirmed the correlation between dam construction and regional precipitation; the precipitation values in the two dam study areas had an increasing trend after the completion of the dams, and the fitting trend line showed an obvious increasing trend. Conclusions According to the analysis of precipitation variation points, it can be concluded that the establishment of the dam affected the precipitation in the area of ∼200 km upstream and increased the precipitation value in this area. The study showed that dam construction has a strong correlation with regional precipitation. Implications It is speculated that the construction of super dams will have a greater impact on precipitation.

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Study on spatio-temporal characteristics of earthquakes in southwest China based on z-value

Cited by 5 publications

References 34 publications

Spatio-Temporal Variation Seismicity Pattern in East Java Between 2002 and 2022 Based on the b-value and Seismic Quiescence z-value

Spatio-Temporal Variation Seismicity Pattern in East Java Between 2002 and 2022 Based on the b-value and Seismic Quiescence z-value

Seismic response analysis of the underground cavern group at the Yingliangbao hydropower station to the 2022 Ms 6.8 Luding earthquake

Impact of dam construction on precipitation: a regional perspective

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