Gravity variations before the Menyuan Ms 6.4 earthquake

Weifeng, Liang; Zhang, Guoqing; Zhu, Yongnan; Xu, Yonghang; Guo, Shusong; Zhao, Yue; Liu, Fang; Zhao, Lingqiang

doi:10.1016/j.geog.2016.04.013

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…7d). Although the quasi-stable adjustment, rather than the classical adjustment, was applied in several previous studies 27–29 , the major characteristics of the gravity changes were in accordance with ours shown in Fig. 7.…”

Section: Discussionsupporting

confidence: 82%

“…The accuracies of the gravity values at measured points from the net adjustment are almost better than 15 μGals, even better than 10 μGals in most cases, which ensure the reliability of the gravity changes with time at the measured stations. Therefore, gravity-change datasets are regarded as one of the most effective geophysical data for investigating the deep processes before the strong earthquakes 10,12 , including the 2016 Menyuan earthquake 27,28,40 .…”

Section: Discussionmentioning

confidence: 99%

“…7. Since the gravity changes resulted from preparation of the 2016 Menyuan earthquake had been described in detail 27–29 and were unnecessary restatement here.

Figure 7Gravity changes on a one-year timescale from 2011 to 2015. The focal mechanism solutions of the 2016 Menyuan earthquake are from USGS 26 .…”

Section: Discussionmentioning

confidence: 99%

“…The observed gravity changed from increase to decrease near the LLL fault and surroundings before the 2016 Menyuan M S 6.4 earthquake 27–29 , suggesting the dynamic information related to the deep process. In this study, the gravity changes following the Menyuan earthquake with time on a one-year scale in the NETP were used to determine the crustal DCs using 3D gravity inversion method.…”

Section: Introductionmentioning

confidence: 97%

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Insight into the preparation of the 2016 MS6.4 Menyuan earthquake from terrestrial gravimetry-derived crustal density changes

Xuan

Jin

Chen³

et al. 2019

Sci Rep

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Geophysical processes of the pre-earthquake activities are difficult to be determined since less pre-seismic signal is observed directly. Crustal density changes derived from the periodical terrestrial gravimetry may provide meaningful deep information for the pre-earthquake cue. In this study, the crustal density changes following the 2016 MS6.4 Menyuan earthquake are estimated using ground-based gravity-change data from 2011 to 2015 in the northeastern Tibetan Plateau. The results show that negative density changes dominate the region between the South Longshou Mountain fault and the Daban Mountain fault except the southeast of this region (the seismic region) during 2011–2012. Positive density changes appeared in the middle crust near the epicenter during 2012–2013 and in the upper and middle crust east of the epicenter approximately 1.5 years before the earthquake (2013–2014), and then negative density changes appeared under and northeast of the epicenter approximately four months before the earthquake (2014–2015). The state of the crustal materials near the seismic region changed from convergence to expansion, in turn, indicating that the characteristics of the deep seismogenic process was corresponding to Amos Nur’s 1974 dilatancy-fluid diffusion model.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

“…7. Since the gravity changes resulted from preparation of the 2016 Menyuan earthquake had been described in detail 27–29 and were unnecessary restatement here.

Figure 7Gravity changes on a one-year timescale from 2011 to 2015. The focal mechanism solutions of the 2016 Menyuan earthquake are from USGS 26 .…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Insight into the preparation of the 2016 MS6.4 Menyuan earthquake from terrestrial gravimetry-derived crustal density changes

Xuan

Jin

Chen³

et al. 2019

Sci Rep

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“…Adanya stress dalam kondisi kritis di zona pusat gempa ini, menimbulkan pergerakan fluida pada lapisan bumi yang ditandai dengan kenaikan atau pengurangan level air, selama stress mencapai kondisi kritis, massa batuan mengalami retakan di sekitar zona pusat gempa yang menyebabkan adanya patahan pada seluruh batuan tersebut. Proses deformasi yang timbul pada zona pusat gempa sebelum terjadi gempa akan menimbulkan adanya zona-zona dengan densitas tinggi dan rendah pada daerah penelitian (Liang, 2016).…”

Section: Selisih Harian Sba DI Titik Episenter Gempa Bumi 6 Maret 2007unclassified

Analisis SBA (Simple Bouguer Anomaly) Sebelum Gempa Padang Panjang 6 Maret 2007 Sebagai Prekursor Gempa Bumi

Rahmi

Pujiastuti

2021

JFU

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Telah dilakukan penelitian mengenai analisis SBA (Simple Bouguer Anomaly) sebelum gempa Padang Panjang 6 Maret 2007 yang bertujuan untuk melihat adanya korelasi antara perubahan anomali gravitasi dengan kejadian gempa bumi. Data gravitasi yang digunakan adalah data dari satelit GRACE (Gravity Recovery And Climate Experiment). Metode yang digunakan adalah metode time-lapse microgravity. Hasil kontur anomali selisih SBA menunjukkan adanya polarisasi anomali gravitasi yang terjadi di sekitar episenter gempa pada 35 hari sebelum gempa. Terdapat zona anomali tinggi di bagian tenggara dan zona anomali rendah di bagian barat daerah penelitian. Berdasarkan hasil sayatan melintang pada kontur harian SBA, diperoleh nilai harian SBA dan grafik harian SBA yang menunjukkan penurunan secara perlahan dari 35 hari hingga 20 hari sebelum gempa. Penurunan maksimum terjadi pada tanggal 12 Februari 2007. Lalu diikuti kenaikan secara terus menerus dari 20 hari hingga 15 hari sebelum gempa. Berdasarkan grafik selisih harian SBA, pada 35 hari sebelum gempa muncul anomali medan gravitasi tanggal 28 Januari 2007 dengan perubahan anomali gravitasi maksimum dari tanggal 22 – 23 Februari 2007 sebesar 0,490763281 µgal pada titik episenter gempa magnitudo 6,4 dan sebesar 0,49639576 µgal pada titik episenter gempa magnitudo 6,3. Sehingga anomali yang muncul tersebut dapat dijadikan pertanda awal (prekursor) gempa bumi. Kata kunci : anomali bouguer, gempa bumi, GRACE, gravitasi, polarisasi

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Earthquake precursors: spatial-temporal gravity changes before the great earthquakes in the Sichuan-Yunnan area

2017

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Gravity variations before the Menyuan Ms 6.4 earthquake

Cited by 8 publications

References 3 publications

Insight into the preparation of the 2016 MS6.4 Menyuan earthquake from terrestrial gravimetry-derived crustal density changes

Insight into the preparation of the 2016 MS6.4 Menyuan earthquake from terrestrial gravimetry-derived crustal density changes

Analisis SBA (Simple Bouguer Anomaly) Sebelum Gempa Padang Panjang 6 Maret 2007 Sebagai Prekursor Gempa Bumi

Earthquake precursors: spatial-temporal gravity changes before the great earthquakes in the Sichuan-Yunnan area

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