The October 13, 2018 Deep Earthquake With Mw = 6.7 in the Kamchatka Subduction Zone With the Epicenter in the Sea of Okhotsk

Chebrov, Danila; Chebrova, A.Yu.; Abubakirov, I.R.; Droznina, S.; Mityushkina, S.V.; Kopilova, G.N.; Ototuk, D.A.; Pavlov, V.M.; Senyukov, S.

doi:10.31431/1816-5524-2019-1-41-5-11

Cited by 5 publications

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“…The intensity of shaking in the area of well YuZ-5 was 5 points on the MSK-64 scale [39]. In [60], this earthquake was called the Zhupanovsky earthquake (hereinafter, the ZhE), and the precursors detected in real time before the ZhE, including the changes in the water level in well E-1 and concentration radon in subsoil gas, were indicated.…”

Section: Seismo-hydrogeodynamic Effectsmentioning

confidence: 99%

Seismo-Hydrogeodynamic Effects in Groundwater Pressure Changes: A Case Study of the YuZ-5 Well on the Kamchatka Peninsula

Копылова

Болдина

2023

Water

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Seismo-hydrogeodynamic effects (SHGEs) in groundwater level (pressure) variations in a range of periods from minutes to hours and days during local and teleseismic earthquakes were considered based on the data of precision observations in a deep piezometric well located in a seismically active region. With the use of the tidal analysis and frequency dependence of the barometric response of the water level, a static confined response of groundwater pressure in a range of periods from hours to the first tens of days was established. The annual water level trend was characterized by the seasonal function of a hydrostatic head change in the well. In the groundwater pressure, changes were detected due to several types of seismo-hydrogeodynamic effects: 1—the coseismic fluctuations during the first tens of seconds and minutes after the arrival of seismic waves from the earthquakes with magnitudes of 5.3–9.1 at epicentral distances of 80–700 km; 2—the supposed hydrogeodynamic precursors of the two strongest events; 3—the four types of variations under the vibration impact of seismic waves from Mw = 6.8–9.1 earthquakes at epicentral distances of 80–14,600 km. The dependence of the distinguished types of SHGEs on the earthquake parameters, the intensity of the seismic impact in the well area and the amplitude-frequency composition of seismic waves were considered.

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Section: Seismo-hydrogeodynamic Effectsmentioning

confidence: 99%

Seismo-Hydrogeodynamic Effects in Groundwater Pressure Changes: A Case Study of the YuZ-5 Well on the Kamchatka Peninsula

Копылова

Болдина

2023

Water

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Empirical Spectral Characteristics of the Medium near Strong-Motion Seismic Stations of Kamchatka

Gusev

Skorkina

2020

Russian Geology and Geophysics

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—Spectral characteristics of the medium around 23 digital strong-motion seismic stations of Kamchatka region have been studied from local earthquake data relative to a reference bedrock station (Petropavlovsk, PET). Spectra are determined by multiband filtering. In each band peak velocity amplitudes, levels of Fourier S-spectra and mean-square coda amplitudes were compared. Average Fourier spectra were obtained from S-wave energy using Parseval’s equation. The difference in hypocentral distances for pairs of stations was compensated by empirical S-wave attenuation functions. Records of more than 300 events were processed, with M = 5–6 and hypocentral distances mainly 100–600 km. The spectral ratios estimated by the three methods show behavior diversity. Some non-rock stations show expected spectral characteristics at high frequencies. The conditions at other stations can be considered similar to those at PET. Some stations show amplifications of up to 10 times in the 20–30 Hz frequency range. In general, the obtained spectral characteristics within 3–5 Hz are consistent with the expected trends corresponding to known local geology around strong-motion stations.

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SEISMICITY of KAMCHATKA and COMMANDERISLANDS in 2018–2019

Chebrov,

Matveenko,

Romasheva

et al. 2023

Earthquakes in Northern Eurasia

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The seismicity review of Kamchatka and surrounding territories for 2018–2019 is given. In the Kamchatka earthquake catalogue, the minimum local magnitude of completeness is MLmin=3.8, and for the Kamchatka seismically active region (latitude = 50.5–56.5° N, longitude = 156.5–167° E) MLmin=3.7, and for earthquakes with h≥350 km under the Okhotsk sea MLmin=3.8. The Kamchatka earthquake catalogue for 2018–2019, published in the Appendix to this article, includes 3646 events with ML≥3.5; 228 earthquakes with ML=3.65–7.3 were felt in Kamchatka and surrounding areas with seismic intensity I of 1–2 to 6–7 according to the Seismic Intensity Scale-2017 (Russian state standard). For 134 events with ML≥5.0 that occurred in 2018–2019 within the area of responsibility of Кamchatka branch of Geophysical Survey RAS, an attempt to calculate the seismic moment tensor (SMT) was made. The SMT and depth h of the equivalent point source were calculated for 67 earthquakes in 2018 with a range of ML=5.0–7.3, and for 67 events in 2019 with a range of ML=5.0–6.45. The level of seismicity according to the "SOUS'09" scale in 2018 corresponded to the “background increased”, but within the assessment accuracy – “high”; for 2019 it was the “background average”. On December 20, 2018, there was a strong earthquake with Mw=7.3, named “the Angular Uplift earthquake”. This earthquake was the strongest intraplate event, which belongs to the region south of the junction zone of the Kamchatka and Aleutian trenches The earthquake was accompanied by a large number of aftershocks.

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The October 13, 2018 Deep Earthquake With Mw = 6.7 in the Kamchatka Subduction Zone With the Epicenter in the Sea of Okhotsk

Cited by 5 publications

References 0 publications

Seismo-Hydrogeodynamic Effects in Groundwater Pressure Changes: A Case Study of the YuZ-5 Well on the Kamchatka Peninsula

Seismo-Hydrogeodynamic Effects in Groundwater Pressure Changes: A Case Study of the YuZ-5 Well on the Kamchatka Peninsula

Empirical Spectral Characteristics of the Medium near Strong-Motion Seismic Stations of Kamchatka

SEISMICITY of KAMCHATKA and COMMANDERISLANDS in 2018–2019

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