Is There an Earthquake Weather?

Parrot, M.; Pinçon, Jean-Louis

doi:10.4236/ojer.2020.92005

Cited by 2 publications

(1 citation statement)

References 30 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These studies were conducted considering a single earthquake or statistical investigations, for example, by Li and Parrot [16] or Ouyang et al [17], which investigate ULF ionospheric electric field variation related to global seismic activity. Parrot and Pinçon [18] investigated the possible correlation between whistler waves recorded by the DEMETER satellite and shallow (depth ≤ 20 km) earthquakes of magnitude 4.8+ or 5.4+. They identified a statistically significant increase of about 11% in the intensity of whistler activity (originated from lightning) one day before the earthquakes and within 200 km of the epicentre.…”

Section: Previous Studies On Seismo-ionospheric Disturbancesmentioning

confidence: 99%

CSES-01 Electron Density Background Characterisation and Preliminary Investigation of Possible Ne Increase before Global Seismicity

Chen,

Marchetti,

Zhu

et al. 2023

Atmosphere

View full text Add to dashboard Cite

In this paper, we provide a characterisation of the ionosphere from April 2018 to September 2022 for 48 investigated months. We used the data of the China Seismo Electromagnetic Satellite (CSES-01), which is a sun-synchronous satellite with five days of revisit time and fixed local time of about 2 a.m. and 2 p.m. The unique orbit of CSES-01 permitted us to produce a monthly background of the ionosphere for night- and daytime with median values acquired during geomagnetic quiet time in equatorial and mid-latitude regions (i.e., between 50° S and 50° N of geographical latitude). We compared the obtained CSES-01 monthly median values with the solar activity in terms of sunspot numbers, and we found a high correlation of 0.89 for nighttime and 0.85 for daytime between the mean sunspot number and the maximum of the characterised CSES-01 Ne map values. In addition, we extracted all the anomalous positive increases in CSES-01 electron density and compared them with the Worldwide M5.5+ shallow earthquakes. We tested two different definitions of anomaly based on median and interquartile range or (mild) outliers. We tried two relationships between anomalies inside Dobrovolsky’s area before the earthquake and the magnitude of the same seismic events: one which considers distance in space and time and a second which only uses the anticipation time of the anomaly before the earthquake. Using both anomaly definitions, we searched the best coefficients for these two laws for mid-latitude and equational regions. We found that the best coefficients are independent of the anomaly definition, but better accuracy (greater than 80%) is obtained for the outlier definition. Finally, using receiving operating characteristic (ROC) curves, we show that CSES-01 increases seem statistically correlated to the incoming seismic activity.

show abstract

Section: Previous Studies On Seismo-ionospheric Disturbancesmentioning

confidence: 99%

CSES-01 Electron Density Background Characterisation and Preliminary Investigation of Possible Ne Increase before Global Seismicity

Chen,

Marchetti,

Zhu

et al. 2023

Atmosphere

View full text Add to dashboard Cite

show abstract

Looking for Earthquake Precursors From Space: A Critical Review

2021

View full text Add to dashboard Cite

Starting from late seventies, many observations have been reported about observations in space of signals reconciled with earthquakes and claimed as possible preseismic measurements. The detected parameters range from electromagnetic field components (in a large band of frequencies) to plasmas parameters; from particles detection to thermal anomalies; etc. Up to the DEMETER mission, the analyses have been carried out on datasets gathered by not devoted satellites. Even beyond the results obtained, the DEMETER mission has constituted a milestone for space-based investigations of seismo-associated phenomena drawing a baseline for next missions with respect instruments, observational strategy and measurements uncertainty. Nowadays, the CSES-01 satellite – developed within a sino-italian collaboration with the participation also of Austrian Institutes – represents the most advanced mission for investigating near-Earth electromagnetic environment aimed at extending the observation of earthquake precursors to a long time series. The benefit of the mission is even higher by considering that CSES-01 is the first of a program of several LEO small satellites, the second of which will be launched on 2023 with the same instruments and orbit of CSES-01, but with a shift of half of an orbit in order to monitor each trace twice per orbit. The article gives a short survey of space-based observations of preseismic phenomena from the early studies up to the more recent ones, critically reviewing results, hypotheses and trends in this research field. The supposed physical processes proposed to explain the observations are still unable to explain the large variety of the phenomenology, the statistical significance of the results are highly debated, and more in general a common consensus is still missing. Anyway, the investigation of the seismo-associated phenomena from space is a challenge for near future Earth observation.

show abstract

Is There an Earthquake Weather?

Cited by 2 publications

References 30 publications

CSES-01 Electron Density Background Characterisation and Preliminary Investigation of Possible Ne Increase before Global Seismicity

CSES-01 Electron Density Background Characterisation and Preliminary Investigation of Possible Ne Increase before Global Seismicity

Looking for Earthquake Precursors From Space: A Critical Review

Contact Info

Product

Resources

About