Ionospheric Scintillation Anomalies Associated with the 2021 La Palma Volcanic Eruption Detected with Gnss-R and Gnss-Ro Observations

Molina, Carlos; Semlali, B.E. Boudriki; González-Casado, Guillermo; Park, H.; Camps, Adriano

doi:10.1109/igarss46834.2022.9883701

Cited by 5 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of the pre-earthquake LST anomalies detected before strong and moderate earthquakes (M w ≥ 4) studied in this work may be used in the future in conjunction with other proxies for short-term earthquake risk prediction. In addition, we can reuse the same model for other parameters, notably ionospheric scintillation parameters [48,49].…”

Section: Discussionmentioning

confidence: 99%

First Results on the Systematic Search of Land Surface Temperature Anomalies as Earthquakes Precursors

et al. 2023

View full text Add to dashboard Cite

Every year, earthquakes cause thousands of casualties and high economic losses. For example, in the time frame from 1998 to 2018, the total number of casualties due to earthquakes was larger than 846 thousand people, and the recorded economic losses were about USD 661 billion. At present, there are no earthquake precursors that can be used to trigger a warning. However, some studies have analyzed land surface temperature (LST) anomalies as a potential earthquake precursor. In this study, a large database of global LST data from the Geostationary Operational Environmental Satellite (GOES) and AQUA satellites during the whole year 2020 has been used to study the LST anomalies in the areas affected by earthquakes. A total of 1350 earthquakes with a magnitude larger than M4 were analyzed. Two methods widely used in the literature have been used to detect LST anomalies in the detrended LST time series: the interquartile (IQT) method and the standard deviation (STD). To the authors’ knowledge, it is the first time that the confusion matrix (CM), the receiver operating characteristic curve (ROC), and some other figures of merit (FoM) are used to assess and optimize the performance of the methods, and to select the optimum combination that could be used as a proxy for their occurrence. A positive anomaly was found a few days before the studied earthquakes, followed by the LST decrease after the event. Further studies over larger regions and more extended periods will be needed to consolidate these encouraging results.

show abstract

Section: Discussionmentioning

confidence: 99%

First Results on the Systematic Search of Land Surface Temperature Anomalies as Earthquakes Precursors

et al. 2023

View full text Add to dashboard Cite

show abstract

“…COSMIC-2 provides GPS and LEO coordinates for each occultation but lacks a reference coordinate for determining the S 4 location. The tangent point is calculated using the GPS and LEO satellite positions from COSMIC-2 using the same methods described in [65], which can be seen in [66]. This is later used to filter data based on the distance around earthquake epicenters or latitude-longitude pairs.…”

Section: Satellite Gnss-ro Datamentioning

confidence: 99%

Potential Earthquake Proxies from Remote Sensing Data

Boudriki Semlali,

Molina,

Carvajal Librado

et al. 2024

New Insights on Disaster Risk Reduction [Working Title]

View full text Add to dashboard Cite

At present, there is no clear scientific evidence of reliable earthquake precursors that can be used as an early warning system. However, many studies have also reported the existence of faint signatures that appear to be coupled to the occurrence of earthquakes. These anomalies have traditionally been detected using data from in-situ sensors near high-seismicity regions. On the other hand, remote sensors offer the potential of large spatial coverage and frequent revisit time, allowing the observation of remote areas such as deserts, mountains, polar caps, or the ocean. This chapter revises the state-of-the-art of the understanding of lithosphere–atmosphere–ionosphere coupling. It also presents recent studies by the authors’ ongoing investigation on short-to-midterm earthquake precursors. The Earth observation variables discussed are (1) surface temperature anomalies from thermal infrared or microwave radiometer measurements, (2) atmospheric signatures, (3) ionospheric total electron density fluctuations or scintillation measured from GNSS signals, and (4) other geophysical variables, including geomagnetic field fluctuations, changes in the Schumann resonance frequency, or low-frequency electromagnetic radiation. However, despite the seismic hazard risk models that exist and the results shown by these studies, it is still very difficult to predict the occurrence of earthquakes.

show abstract

“…The combination of GNSS-R and GNSS RO can depict the Earth in three dimensions. Some science investigations on the combination of GNSS-R and GNSS RO include grazing angle phase altimetry [46], improving GNSS RO data quality using GNSS-R measurements [47] and monitoring of ionospheric anomalies [48].…”

Section: Cooperation Between Gnss-r and Gnss Romentioning

confidence: 99%

GNOS-II on Fengyun-3 Satellite Series: Exploration of Multi-GNSS Reflection Signals for Operational Applications

Sun,

Huang,

Xia

et al. 2023

Remote Sensing

View full text Add to dashboard Cite

The Global Navigation Satellite System Occultation Sounder II (GNOS-II) payload onboard the Chinese Fengyun-3E (FY-3E) satellite is the world’s first operational spaceborne mission that can utilize reflected signals from multiple navigation systems for Earth remote sensing. The satellite was launched into an 836-km early-morning polar orbit on 5 July 2021. Different GNSS signals show different characteristics in the observations and thus require different calibration methods. With an average data latency of less than 3 h, many near real-time applications are possible. This article first introduces the FY-3E/GNOS-II mission and instrument design, then describes the extensive calibration methods for the multi-GNSS measurements, and finally presents application results in the remote sensing of ocean surface winds, land soil moisture and sea ice extent. Especially, the ocean surface wind product has been used in operational applications such as assimilation in the numerical weather prediction model and monitoring of tropical cyclones. Currently, GNOS-II has been carried by FY-3E, FY-3F (launched in August 2023) and FY-3G (launched in April 2023). It will be also carried by future follow-on FY series and a more complete multi-GNSS reflectometry constellation will be established.

show abstract

Ionospheric Scintillation Anomalies Associated with the 2021 La Palma Volcanic Eruption Detected with Gnss-R and Gnss-Ro Observations

Cited by 5 publications

References 6 publications

First Results on the Systematic Search of Land Surface Temperature Anomalies as Earthquakes Precursors

First Results on the Systematic Search of Land Surface Temperature Anomalies as Earthquakes Precursors

Potential Earthquake Proxies from Remote Sensing Data

GNOS-II on Fengyun-3 Satellite Series: Exploration of Multi-GNSS Reflection Signals for Operational Applications

Contact Info

Product

Resources

About