Search of the operational earthquake precursors on the basis of the identification measurements of the seismographic records

2016 ◽  
Author(s):  
Yu. N. Klikushin ◽  
V. Yu. Kobenko ◽  
K. T. Koshekov ◽  
O. M. Belosludtsev ◽  
A. K. Koshekov
Keyword(s):  
Earthquake Precursors ◽  
Identification Measurements

Integrated Search for Taiwan Earthquake Precursors (iSTEP)

2016 ◽  
Vol 136 (5) ◽  
pp. 214-220 ◽  
Author(s):  
Jann-Yenq Liu ◽  
Yi-Ben Tsai ◽  
Chieh-Hung Chen ◽  
Yuh-Ing Chen ◽  
Horng-Yuan Yen
Keyword(s):  
Earthquake Precursors ◽  
Taiwan Earthquake

Using modern seismological data to reveal earthquake precursors

2007 ◽  
Vol 9 (2) ◽  
pp. 1-17 ◽  
Author(s):  
G. A. Sobolev ◽  
A. A. Lyubushin
Keyword(s):  
Earthquake Precursors ◽  
Seismological Data

Alarm systems based on a pair of short-term earthquake precursors

1988 ◽  
Vol 78 (4) ◽  
pp. 1538-1549
Author(s):  
Giuseppe Grandori ◽  
Elisa Guagenti ◽  
Federico Perotti
Keyword(s):  
Statistical Analysis ◽  
Active Region ◽  
Southern California ◽  
Main Shock ◽  
Weak Shock ◽  
Earthquake Precursors ◽  
Alarm System ◽  
Short Term ◽  
Alarm Systems

Abstract A statistical analysis of the foreshock-main shock correlation for a seismically active region in Italy is presented. It is found that the probability that a weak shock be followed within 2 days by a main shock is of the order of 2 per cent, while the probability that a main shock be preceded by a foreshock is of the order of 50 per cent. These results are quite similar to those found by L. Jones (1985) for southern California. The effectiveness of alarm systems based on a pair of short-term earthquake precursors is then analyzed. In particular, the analysis shows under what conditions the precursor, consisting of potential foreshocks, could be combined with another precursor to provide a reasonably effective alarm system.

How to Predict Earthquakes by Using Simple and Reliable Method? Peru, Chile, Italy, Greece, New Zealand, Andaman and Nicobar Islands, India

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
Prakash Pillai S ◽  
Keyword(s):  
Centrifugal Force ◽  
Reliable Method ◽  
Orbital Motion ◽  
Earthquake Precursors ◽  
Generation Process ◽  
Tectonic Plates ◽  
The Earth ◽  
Eruption Precursors ◽  
Weather Anomalies ◽  
Seasonal Weather

This paper intended to highlight the simple, quick and reliable method to detect impending earthquake�s location. Volcanic eruption precursors are originated only around the volcanos, like that the onshore earthquake precursors are originated only from earthquake epicenter zones. Epicenter zones are earthquake zones, a little variation of fault zone, it comprises movable tectonic plates. Due to the orbital motion of the earth, centrifugal force generated, this centrifugal force is the major driving force of tectonic plates. The position of the orbital motion of the earth generated seasonal variations/atmospheric weather anomalies as onshore earthquake precursors and earthquakes, year after year repeating at same places. The generation process of seasonal weather anomalies is the part of generation process of earthquakes at epicenter zones. Both seasonal weather anomalies and seismic anomalies are not continued all through the year at same places. When earth comes to particular position, tectonic plates of particular epicenter zones are set to more active and becomes unstable epicenter zones, causes identifiable, observable, recordable and testable onshore earthquake precursors 1-15 days prior to earthquakes occur.

scholarly journals Brief communication "On the recent reaffirmation of ULF magnetic earthquakes precursors"

2011 ◽  
Vol 11 (8) ◽  
pp. 2193-2198 ◽  
Author(s):  
F. Masci
Keyword(s):  
Geomagnetic Activity ◽  
Geomagnetic Field ◽  
Earthquake Precursors

Abstract. Hayakawa et al. (2009) and Hayakawa (2011) have recently reviewed some "anomalous" ULF signatures in the geomagnetic field which previous publications have claimed to be earthquake precursors. The motivation of this review is "to offer a further support to the definite presence of those anomalies". Here, these ULF precursors are reviewed once again. This brief communication shows that the reviewed anomalies do not "increase the credibility on the presence of electromagnetic phenomena associated with an earthquake" since these anomalous signals are actually caused by normal geomagnetic activity. Furthermore, some of these ULF precursors have just been rebutted by previous publications.

scholarly journals Monitoring of the geomagnetic and geoelectric field in two regions of Greece for the detection of earthquake precursors

1997 ◽  
Vol 40 (2) ◽  
Author(s):  
G. Vargemezis ◽  
J. Zlotnicki ◽  
G. Tsokas ◽  
B. C. Papazachos ◽  
E. E. Papadimitriou
Keyword(s):  
Climatic Changes ◽  
Earthquake Precursors ◽  
Geoelectric Field ◽  
The South ◽  
Temperature Changes ◽  
Central Greece ◽  
South Eastern ◽  
Precursory Phenomena ◽  
Of Greece ◽  
High Seismicity

Two magnetotelluric stations have been installed in the South-Eastern Thessaly basin (Central Greece), which have recorded the geomagnetic and geoelectric fields since 1993. The aim is to detect long lasting abnormal changes of the geoelectric field which may be due to impending earthquakes. The geoelectric recordings were checked against the climatic changes such as temperature changes and precipitation and no correlation was observed. Ten anomalies were observed with characteristics similar to seismoelectric signals which have been reported in the literature and thus we can assume that these changes constitute precursory phenomena. The duration of these signals varies from several days to a few weeks. Some of them keep on developing until the occurrence of an earthquake, and others appear like transient changes several days before. The high seismicity of the area where the stations are located creates difficulties in the correlation of the signals with certain shocks.

scholarly journals On the existence of earthquake precursors

1999 ◽  
Vol 42 (5) ◽  
Author(s):  
F. Evison
Keyword(s):  
Empirical Research ◽  
Earthquake Prediction ◽  
Power Law ◽  
Earthquake Precursors ◽  
Time Varying ◽  
Formal Testing ◽  
High Degree ◽  
Experimental Stage

Earthquake prediction based on precursors can aim to provide fully quantified, time-varying, synoptic forecasts, which do not depart from physical and geological principles, and are amenable to formal testing. These features are in contrast to the traditional occultist or soothsayer style of prediction. The recently-advanced, pre-emptive hypothesis that earthquakes are intrinsically unpredictable, and precursors non-existent, is also amenable to testing: it is refuted by the well-known relations between mainshocks and aftershocks. These relations show that a set of aftershocks is to a high degree predictable from the mainshock, so that, as a matter of principle, the mainshock is a precursor to its aftershocks. This result is compatible with the power-law property of seismicity, on which the unpredictability hypothesis is based. Empirical research on most precursors is difficult because of the scarcity of data, and is still largely at the anecdotal stage. Additional difficulties at the experimental stage are exemplified by the failure of the Tokai and Parkfield experiments to advance the study of precursors as planned. A comparative abundance of data is available on seismicity anomalies, and research on this type of precursor is progressing towards the operational stage.

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

2021 ◽  
Vol 331 ◽  
pp. 07012
Author(s):  
Cipta Ramadhani ◽  
Bulkis Kanata ◽  
Abdullah Zainuddin ◽  
Rosmaliati ◽  
Teti Zubaidah
Keyword(s):  
Data Processing ◽  
Geomagnetic Field ◽  
Field Data ◽  
Low Frequency ◽  
Earthquake Precursors ◽  
Polarization Ratio ◽  
Magnetic Polarization ◽  
Central Frequency ◽  
Electromagnetic Data ◽  
Geomagnetic Anomaly

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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