Insignificant solar‐terrestrial triggering of earthquakes

Love, Jeffrey J.; Thomas, J. N.

doi:10.1002/grl.50211

Cited by 54 publications

(38 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It should be noted that most investigations of magnetism and earthquakes have not been conclusive because of the use of magnetic records that are heavily governed by the external conditions of the ionosphere, making the results meaningless in the geodynamic context (Thomas et al, 2009;Love and Thomas, 2013;Masci and Thomas, 2015). Despite this, there is a great amount of recent and rigorous research that has shown a statistical relation between magnetism and earthquakes, and thus, this effect could not be negligible in other magnetic properties, such as the Rc or the study of particle flux at Earth's ground level (Hayakawa et al, 2015;Contoyiannis et al, 2016;Potirakis et al, 2016a, b;De Santis et al, 2017;Oikonomou et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Latitudinal variation rate of geomagnetic cutoff rigidity in the active Chilean convergent margin

2018

View full text Add to dashboard Cite

Abstract. We present a different view of secular variation of the Earth's magnetic field, through the variations in the threshold rigidity known as the variation rate of geomagnetic cutoff rigidity (VRc). As the geomagnetic cutoff rigidity (Rc) lets us differentiate between charged particle trajectories arriving at the Earth and the Earth's magnetic field, we used the VRc to look for internal variations in the latter, close to the 70 • south meridian. Due to the fact that the empirical data of total magnetic field BF and vertical magnetic field Bz obtained at Putre (OP) and Los Cerrillos (OLC) stations are consistent with the displacement of the South Atlantic magnetic anomaly (SAMA), we detected that the VRc does not fully correlate to SAMA in central Chile. Besides, the lower section of VRc seems to correlate perfectly with important geological features, like the flat slab in the active Chilean convergent margin. Based on this, we next focused our attention on the empirical variations of the vertical component of the magnetic field Bz, recorded in OP prior to the Maule earthquake in 2010, which occurred in the middle of the Chilean flat slab. We found a jump in Bz values and main frequencies from 3.510 to 5.860 µHz, in the second derivative of Bz, which corresponds to similar magnetic behavior found by other research groups, but at lower frequency ranges. Then, we extended this analysis to other relevant subduction seismic events, like Sumatra in 2004 and Tohoku in 2011, using data from the Guam station. Similar records and the main frequencies before each event were found. Thus, these results seem to show that magnetic anomalies recorded on different timescales, as VRc (decades) and Bz (days), may correlate with some geological events, as the lithosphereatmosphere-ionosphere coupling (LAIC).

show abstract

Section: Introductionmentioning

confidence: 99%

Latitudinal variation rate of geomagnetic cutoff rigidity in the active Chilean convergent margin

2018

View full text Add to dashboard Cite

show abstract

“…Signals identified as possibly precursory might have alternative causes that are unrelated to the earthquake process. Thus, when examining reports of earthquake precursors, it is important to determine if effects similar to the possible precursors are also observed during earthquakes (Park et al, 1993). Since the major energy is released during the earthquake, and not before the earthquake, if co-seismic changes do not occur, it is unlikely that the cloud formations have any physical relationship with the earthquake.…”

Section: Discussionmentioning

confidence: 99%

On a report that the 2012 <i>M</i> 6.0 earthquake in Italy was predicted after seeing an unusual cloud formation

Thomas

Masci

Love

2015

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. Several recently published reports have suggested that semi-stationary linear-cloud formations might be causally precursory to earthquakes. We examine the report of Guangmeng and Jie (2013), who claim to have predicted the 2012 M 6.0 earthquake in the Po Valley of northern Italy after seeing a satellite photograph (a digital image) showing a linear-cloud formation over the eastern Apennine Mountains of central Italy. From inspection of 4 years of satellite images we find numerous examples of linear-cloud formations over Italy. A simple test shows no obvious statistical relationship between the occurrence of these cloud formations and earthquakes that occurred in and around Italy. All of the linear-cloud formations we have identified in satellite images, including that which Guangmeng and Jie (2013) claim to have used to predict the 2012 earthquake, appear to be orographic – formed by the interaction of moisture-laden wind flowing over mountains. Guangmeng and Jie (2013) have not clearly stated how linear-cloud formations can be used to predict the size, location, and time of an earthquake, and they have not published an account of all of their predictions (including any unsuccessful predictions). We are skeptical of the validity of the claim by Guangmeng and Jie (2013) that they have managed to predict any earthquakes.

show abstract

“…The great majority of studies of the magnetic field and seismic events have been carried out relating temporal variations in the geomagnetic field with frequencies which are comparable to variations in the ionosphere, the space medium and human activity (0.01 − 10 ). Besides, they have required specific chemical and geological conditions in fault zones, which restrains the arguments of such studies as they cannot establish any sort of causal mechanism [Thomas et al, 2009a, Thomas et al, 2009b, Thomas et al, 2012, Love and Thomas, 2013, Scoville et al, 2015. We used the first and second derivatives of the component in the Putre and Ester Island (IPM) station magnetometers, which have not been thoroughly investigated.…”

Section: Observatories Of Geomagnetic Data and Magneto-seismic Relationmentioning

confidence: 99%

Analysis of geomagnetic measurements prior the Maule (2010), Iquique (2014) and Illapel (2015) earthquakes, in the Pacific Ocean sector of the Southern Hemisphere

Cordaro

Venegas-Aravena

Laroze

2019

Preprint

View full text Add to dashboard Cite

Abstract. It has been possible to detect variations in the vertical component of the geomagnetic field (Bz) through its first and second derivate in a range of frequencies (microHz); these seem to be roughly related with some major seismic subduction events. We studied the period 2010–2015, analysing the daily values of magnetic records over periods close to the last three significant events that occurred through the Chilean margin, i. e., along a boundary between convergent plates that is characterized by the occurrence of seismic events of magnitude greater than Mw8. These are the events of Iquique 2014, Illapel 2015 and Maule 2010, all at different latitudes, on different dates and characterized by different types of margin (erosive or accretionary). Certain similarities were found in the associated magnetic field variations: 1) Variation in the radial or z component of the geomagnetic field and its first and second temporal derivative, modelled as a small jump, and small oscillations in the second derivative, generating a frequency band between 1c / 48.9 hours and 1c / 79.13 Hrs. 2) A variable time lapse of between 30 and 120 days; and 3) The seismic event. Furthermore, when analysing spectrograms for the second temporal derivate of the radial component, different behaviour is found related to its spectral density. This takes the form of an increase in ultra-low frequencies (0.01–0.4 mHz) between the start of the magnetic jump and the seismic event. These frequencies are lower than those found during the last years by research groups that related magnetic field and earthquakes, furthermore the concept of time lapse close to 30 days is in agreement with those research groups. The previous analyses may not be so robust, this is why additionally a new method is used with stations closer to the events and time periods of two years. We analysed the daily cumulative number of anomalous behaviour in z component of magnetic field on ground based magnetometers. The results show an increase in the number of magnetic anomalies prior to the occurrence of the three earthquakes. The behavior of the anomalies is similar to those presented by other authors for other earthquakes with similar methods in ionosphere. All this magnetic features might recover seismic information of the events and could be related with Lithosphere-Atmosphere-Ionosphere Coupling.

show abstract

Insignificant solar‐terrestrial triggering of earthquakes

Cited by 54 publications

References 22 publications

Latitudinal variation rate of geomagnetic cutoff rigidity in the active Chilean convergent margin

Latitudinal variation rate of geomagnetic cutoff rigidity in the active Chilean convergent margin

On a report that the 2012 <i>M</i> 6.0 earthquake in Italy was predicted after seeing an unusual cloud formation

Analysis of geomagnetic measurements prior the Maule (2010), Iquique (2014) and Illapel (2015) earthquakes, in the Pacific Ocean sector of the Southern Hemisphere

Contact Info

Product

Resources

About

Insignificant solar‐terrestrial triggering of earthquakes

Cited by 54 publications

References 22 publications

Latitudinal variation rate of geomagnetic cutoff rigidity in the active Chilean convergent margin

Latitudinal variation rate of geomagnetic cutoff rigidity in the active Chilean convergent margin

On a report that the 2012 &lt;i&gt;M&lt;/i&gt; 6.0 earthquake in Italy was predicted after seeing an unusual cloud formation

Analysis of geomagnetic measurements prior the Maule (2010), Iquique (2014) and Illapel (2015) earthquakes, in the Pacific Ocean sector of the Southern Hemisphere

Contact Info

Product

Resources

About

On a report that the 2012 <i>M</i> 6.0 earthquake in Italy was predicted after seeing an unusual cloud formation