scholarly journals Local magnitude estimate at Mt. Etna

2009 ◽  
Vol 48 (2) ◽  
Author(s):  
S. D'Amico ◽  
V. Maiolino
Keyword(s):  
Magnitude Estimate ◽  
Local Magnitude ◽  
Mt Etna

Calibration of a local magnitude relationship for microseismic events using earthquake data

Geophysics ◽  
2016 ◽  
Vol 81 (2) ◽  
pp. KS61-KS70 ◽  
Author(s):  
Bob Paap ◽  
Philippe Steeghs
Keyword(s):  
Magnitude Estimate ◽  
Storage Site ◽  
Local Magnitude ◽  
Linear Calibration ◽  
Seismic Arrays ◽  
Site Survey ◽  
Calibration Methods ◽  
Microseismic Events ◽  
A Site ◽  
Earthquake Data

Calibration of local seismic arrays is crucial to quantify the magnitude of local microseismic events. This is traditionally done by performing a site survey consisting of calibration shots at known locations with known strength. However, when a calibration survey cannot be conducted, alternative calibration methods are required. We have demonstrated the feasibility of magnitude estimation of microseismic events recorded at the [Formula: see text] storage site at Ketzin (Germany), by analyzing earthquake signals that have been recorded on the noncalibrated geophone array and on standardized seismometers of a regional seismological network. We estimated a linear calibration relation by fitting three different signal attributes for 10 distant earthquakes. Through extrapolation of the linear fit toward lower magnitudes, we estimated the local magnitude of weak local seismic events. Reported magnitudes of the distant earthquakes show significant variation because there are different methods and constants used to calculate a magnitude estimate from recordings on multiple seismometers. As a consequence, there was a considerable spread in our magnitude estimates for the Ketzin events. We found magnitude values in the range between [Formula: see text] and [Formula: see text] for two local events recorded at the Ketzin site. We expect that by incorporating additional distant earthquake data, the uncertainty in this estimate can be further reduced.

scholarly journals A new MD-ML relationship for Mt. Etna earthquakes (Italy)

2016 ◽  
Vol 58 (6) ◽  
Author(s):  
Tiziana Tuvè ◽  
Salvatore D'Amico ◽  
Elisabetta Giampiccolo
Keyword(s):  
Basic Requirement ◽  
Local Magnitude ◽  
Orthogonal Regression ◽  
Seismic Catalogue ◽  
Duration Magnitude ◽  
Dependent Variables ◽  
Mt Etna ◽  
Hazard Estimation ◽  
The Relationship ◽  
Seismic Hazard Estimation

<p class="Testoformula">A homogenous database of magnitude observations is a basic requirement for seismic hazard estimation and other seismic studies. Unfortunately, the magnitude reported in the seismic catalogue of Mt. Etna is not homogenous.  Until 2005 only the duration magnitude (M<sub>D</sub>) is available, though since then the more stable local magnitude (M<sub>L</sub>) has also been calculated. To overcome this limitation, earthquake data recorded at Mt. Etna during the period 2005 – 2014 were used to derive a new relationship between local and duration magnitude, by applying the General Orthogonal Regression (GOR) which is an alternative to least squares when the ratio between errors on the independent and the dependent variables can be estimated. The relationship obtained is:</p><p class="Testoformula">     M<sub>L</sub> = 1.164 (± 0.011) * M<sub>D</sub> - 0.337 (± 0.020)                                          </p><p> The new relationship allows to back-extend the local magnitude dataset to cover a period of about 15 years.</p>

Identification of Radon Anomalies at Mt. Etna (Sicily) by Using Three Different Methods

2010 ◽  
Vol 3 (1) ◽  
pp. 1-16 ◽  
Author(s):  
S. La Delfa ◽  
F. Vizzini ◽  
G. Patanè
Keyword(s):  
Mt Etna

scholarly journals Correction to: Isotopic evolution of prehistoric magma sources of Mt. Etna, Sicily: Insights from the Valle Del Bove

2021 ◽  
Vol 176 (9) ◽  
Author(s):  
P. D. Kempton ◽  
A. Spence ◽  
H. Downes ◽  
J. Blichert-Toft ◽  
J. G. Bryce ◽  
...  
Keyword(s):  
Isotopic Evolution ◽  
Magma Sources ◽  
Mt Etna

scholarly journals Combining High- and Low-Rate Geodetic Data Analysis for Unveiling Rapid Magma Transfer Feeding a Sequence of Violent Summit Paroxysms at Etna in Late 2015

2021 ◽  
Vol 11 (10) ◽  
pp. 4630
Author(s):  
Alessandro Bonforte ◽  
Flavio Cannavò ◽  
Salvatore Gambino ◽  
Francesco Guglielmino
Keyword(s):  
Ground Deformation ◽  
High Rate ◽  
Rate Data ◽  
Scale Analysis ◽  
Feeding System ◽  
Magma Sources ◽  
Mt Etna ◽  
Multi Temporal ◽  
Gnss Measurements ◽  
Low Rate

We propose a multi-temporal-scale analysis of ground deformation data using both high-rate tilt and GNSS measurements and the DInSAR and daily GNSS solutions in order to investigate a sequence of four paroxysmal episodes of the Voragine crater occurring in December 2015 at Mt. Etna (Italy). The analysis aimed at inferring the magma sources feeding a sequence of very violent eruptions, in order to understand the dynamics and to image the shallow feeding system of the volcano that enabled such a rapid magma accumulation and discharge. The high-rate data allowed us to constrain the sources responsible for the fast and violent dynamics of each paroxysm, while the cumulated deformation measured by DInSAR and daily GNSS solutions, over a period of 12 days encompassing the entire eruptive sequence, also showed the deeper part of the source involved in the considered period, where magma was stored. We defined the dynamics and rates of the magma transfer, with a middle-depth storage of gas-rich magma that charges, more or less continuously, a shallower level where magma stops temporarily, accumulating pressure due to the gas exsolution. This machine-gun-like mechanism could represent a general conceptual model for similar events at Etna and at all volcanoes.

scholarly journals Attenuation relationships of peak ground motions in the Jazan Region

2021 ◽  
Vol 14 (3) ◽  
Author(s):  
Ali K. Abdelfattah ◽  
Abdullah Al-amri ◽  
Kamal Abdelrahman ◽  
Muhamed Fnais ◽  
Saleh Qaysi
Keyword(s):  
Saudi Arabia ◽  
Ground Motions ◽  
Prediction Equation ◽  
Peak Ground Velocity ◽  
Local Magnitude ◽  
Ground Acceleration ◽  
Data Set ◽  
Hypocentral Distance ◽  
Distance Range ◽  
Attenuation Relationships

AbstractIn this study, attenuation relationships are proposed to more accurately predict ground motions in the southernmost part of the Arabian Shield in the Jazan Region of Saudi Arabia. A data set composed of 72 earthquakes, with normal to strike-slip focal mechanisms over a local magnitude range of 2.0–5.1 and a distance range of 5–200 km, was used to investigate the predictive attenuation relationship of the peak ground motion as a function of the hypocentral distance and local magnitude. To obtain the space parameters of the empirical relationships, non-linear regression was performed over a hypocentral distance range of 4–200 km. The means of 638 peak ground acceleration (PGA) and peak ground velocity (PGV) values calculated from the records of the horizontal components were used to derive the predictive relationships of the earthquake ground motions. The relationships accounted for the site-correlation coefficient but not for the earthquake source implications. The derived predictive attenuation relationships for PGV and PGA are$$ {\log}_{10}(PGV)=-1.05+0.65\cdotp {M}_L-0.66\cdotp {\log}_{10}(r)-0.04\cdotp r, $$ log 10 PGV = − 1.05 + 0.65 · M L − 0.66 · log 10 r − 0.04 · r , $$ {\log}_{10}(PGA)=-1.36+0.85\cdotp {M}_L-0.85\cdotp {\log}_{10}(r)-0.005\cdotp r, $$ log 10 PGA = − 1.36 + 0.85 · M L − 0.85 · log 10 r − 0.005 · r , respectively. These new relationships were compared to the grand-motion prediction equation published for western Saudi Arabia and indicate good agreement with the only data set of observed ground motions available for an ML 4.9 earthquake that occurred in 2014 in southwestern Saudi Arabia, implying that the developed relationship can be used to generate earthquake shaking maps within a few minutes of the event based on prior information on magnitudes and hypocentral distances taking into considerations the local site characteristics.

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