Changes of the Geomagnetic Signals Linked to Tohoku Earthquake on March 11th 2011

Kanata, Bulkis; Zubaidah, Teti; Ramadhani, Cipta; Irmawati, Budi

doi:10.14716/ijtech.v5i3.611

Cited by 9 publications

(4 citation statements)

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“…It is known that earthquakes are a natural hazard which could trigger massive damage to a region such as Indonesia (Kanata et al, 2014;Sukanta et al, 2015). In 2000, a 7.90 Mw earthquake occurred in Bengkulu Province, Indonesia.…”

Section: Introductionmentioning

confidence: 99%

Reliability Study of Spectral Acceleration Designs Against Earthquakes in Bengkulu City, Indonesia

Mase¹

2018

IJTech

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This paper presents a reliability study of spectral acceleration designs against earthquakes in Bengkulu City. Seismic Hazard Analysis of 1,968 events is performed to define the controlling earthquake event. Furthermore, the controlling earthquake is used as the scale factor to generate five input motions for one-dimensional seismic response analysis. The spectral accelerations resulting from the analysis are then compared to the updated spectral acceleration design. The results show that spectral acceleration designs are still able to cover the spectral acceleration of seismic response analysis. However, for the short period, the spectral acceleration of seismic response analysis exceeds the designed spectral acceleration. This is a matter of concern, since most of the building natural period in Bengkulu City is still categorized as short. In general, this study brings awareness to the design aspect considering earthquakes in Bengkulu City in order to reduce the possible impact on structures in the future.

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Section: Introductionmentioning

confidence: 99%

Reliability Study of Spectral Acceleration Designs Against Earthquakes in Bengkulu City, Indonesia

Mase¹

2018

IJTech

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“…Based on data, The KAK observatory provides the most visible indicators before the earthquake. This result implies that the closer an observatory is near the epicenter, the more anomalous data is recorded [14]. Based on these results, we suggest that the precursors can be noticed around three weeks (18 days) before an earthquake occurs.…”

Section: Resultsmentioning

confidence: 57%

Geomagnetic anomaly associated with Fukushima earthquake on February 13^th, 2021

et al. 2021

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In this study, we performed research on electromagnetic anomalies related to earthquakes as early signs (precursors) that occurred in Fukushima, Japan on February 13th, 2021. The research focused on the utilization of geomagnetic field data which was derived from the Kakioka (KAK), Kanoya (KNY), and Memambetsu (MMB) observatories, particularly in the ultra-low frequency (ULF) to detect earthquake precursors. The method of electromagnetic data processing was conducted by applying a polarization ratio. In addition, we improved the methodology by splitting the ULF data (which ranged from 0.01-0.1 Hz) into 9 central frequencies and picking up the highest value from each central frequency to get the polarization ratio. The anomaly of magnetic polarization was identified 2-3 weeks before the mainshock in a narrowband frequency in the range of 0.04-0.05 Hz.

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“…Based on the values of α and F(n) the constant is considered an anomaly seen 1-3 days before the preliminary earthquake Mw 6.40 (28/07/2018) UTC and 10 days before the main Mw 6.90 earthquake (05/08/2018). The time span of these anomalous events is also seen in research conducted by (Akhoondzadeh et al, 2019;Fu et al, 2020;Kanata et al, 2014;Senturk et al, 2019;Shah et al, 2019Shah et al, , 2021Song et al, 2020). According to research Supendi et al ( 2020), an Mw 6.40 event most likely preceded the entire series of Lombok earthquakes in 2018 as an initial event or foreshock.…”

Section: Anomaly Of the Seismic Signal Data Using Dfa Methodsmentioning

confidence: 74%

Unraveling the Seismic Signal Anomaly at Mount Rinjani Station: In-Depth Exploration with the Detrended Fluctuation (DFA) Analysis Method in Connection with the 2018 Big Earthquake on Lombok Island, West Nusa Tenggara

Kanata,

Rosmaliati,

Zubaidah

et al. 2024

jppipa, pendidikan ipa, fisika, biologi, kimia

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We analyzed the seismic signals of the Mount Rinjani station to identify possible seismic anomalies before a series of major earthquakes on Lombok Island in 2018. We observe anomalies before earthquake events Mw >= 5.90. This research applies the detrended fluctuation analysis (DFA) method to investigate possible earthquake precursors associated with the analyzed earthquake. The results showed a relationship between scaling seismic signals (α) that exceeds the threshold of α values during the analysis period, and there is a deviation of the root mean square fluctuations in the corresponding scaling that should be rising but constant. The value of α with constant root mean square fluctuations occurs one to three days before the preliminary earthquake Mw 6.40 (28/07/2018) UTC and eight to 10 days before the main earthquake Mw 6.90 (05/08/2018). The Mw 6.90 earthquake had the most magnitude and could significantly contribute to the appearance of seismic anomalies.

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Changes of the Geomagnetic Signals Linked to Tohoku Earthquake on March 11th 2011

Cited by 9 publications

References 0 publications

Reliability Study of Spectral Acceleration Designs Against Earthquakes in Bengkulu City, Indonesia

Reliability Study of Spectral Acceleration Designs Against Earthquakes in Bengkulu City, Indonesia

Geomagnetic anomaly associated with Fukushima earthquake on February 13^th, 2021

Unraveling the Seismic Signal Anomaly at Mount Rinjani Station: In-Depth Exploration with the Detrended Fluctuation (DFA) Analysis Method in Connection with the 2018 Big Earthquake on Lombok Island, West Nusa Tenggara

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Changes of the Geomagnetic Signals Linked to Tohoku Earthquake on March 11th 2011

Cited by 9 publications

References 0 publications

Reliability Study of Spectral Acceleration Designs Against Earthquakes in Bengkulu City, Indonesia

Reliability Study of Spectral Acceleration Designs Against Earthquakes in Bengkulu City, Indonesia

Geomagnetic anomaly associated with Fukushima earthquake on February 13th, 2021

Unraveling the Seismic Signal Anomaly at Mount Rinjani Station: In-Depth Exploration with the Detrended Fluctuation (DFA) Analysis Method in Connection with the 2018 Big Earthquake on Lombok Island, West Nusa Tenggara

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Product

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Geomagnetic anomaly associated with Fukushima earthquake on February 13^th, 2021