scholarly journals A tectonomagnetic effect detected in Central Italy

1994 ◽  
Vol 37 (1) ◽  
Author(s):  
G. Mele ◽  
A. Meloni ◽  
P. Palangio
Keyword(s):  
Field Intensity ◽  
Geomagnetic Field ◽  
Central Italy ◽  
Volcanic Eruptions ◽  
Intensity Data ◽  
Absolute Level ◽  
Tectonic Events ◽  
Railway System ◽  
The Absolute ◽  
Geomagnetic Intensity

Significant variations in the absolute value of the geomagnetic field intensity related to tectonic events, as earthquakes and volcanic eruptions, have been observed in several cases. To detect such a tectonomagnetic effect related to seismic activity, a seismomagnetic network was installed by the Istituto Nazionale di Geofisica (ING) in the Abruzzi region (CentraI Italy), in July 1989. This area is being uplifting since the Pliocene. A logistic compromise between geophysical requirements and the electrified railway system tracks distribution led to the installation of five total magnetic field intensity data acquisition sites. From July 1989 to September 1992 geomagnetic intensity data were simultaneously recorded at all stations and compared to that recorded at the L'Aquila Observatory, located in the same area. A variation of about 10 nT in the absolute level of the geomagnetic field was measured at two stations located on the eastern side of the network. We suggest that the detected magnetic anomaly could resuIt from aseismic-changes in crustal stress during this time.

scholarly journals Magnetic anomalies possibly linked to local low seismicity

2009 ◽  
Vol 9 (5) ◽  
pp. 1567-1572 ◽  
Author(s):  
F. Masci ◽  
P. Palangio ◽  
M. Di Persio
Keyword(s):  
Geomagnetic Field ◽  
Central Italy ◽  
Low Frequency ◽  
Magnetic Anomalies ◽  
Tectonic Activity ◽  
The Past ◽  
Tectonic Events ◽  
The City ◽  
Network Station ◽  
The Magnetic Field

Abstract. During the last twenty years a time-synchronized network of magnetometers has operated in Central Italy along the Apennine chain to monitor the magnetic field anomalies eventually related to the tectonic activity. At present time the network consists of five stations. In the past only few anomalies in the local geomagnetic field, possibly associated to earthquakes, has been observed, not least because the network area has shown a low-moderate seismic activity with the epicentres of the few events with Ml≥5 located away from the network station. During 2007 two Ml≈4 earthquakes occurred in proximity of two stations of the network. Here we report the magnetic anomalies in the geomagnetic field that could be related with these tectonic events. To better investigate these two events a study of ULF (ultra-low-frequency) emissions has been carried out on the geomagnetic field components H, D, and Z measured in L'Aquila Observatory during the period from January 2006 to December 2008. We want to stress that this paper refers to the period before the 2009 L'Aquila seismic sequence which main shock (Ml=5.8) of 6 April heavily damaged the medieval centre of the city and surroundings. At present time the analysis of the 2009 data is in progress.

scholarly journals The INGV tectonomagnetic network: 2004–2005 preliminary dataset analysis

2006 ◽  
Vol 6 (5) ◽  
pp. 773-777 ◽  
Author(s):  
F. Masci ◽  
P. Palangio ◽  
A. Meloni
Keyword(s):  
Local Field ◽  
Geomagnetic Field ◽  
Central Italy ◽  
The Other ◽  
Intensity Data ◽  
National Network ◽  
The Earth ◽  
Complete Dataset ◽  
Dataset Analysis ◽  
Geomagnetic Anomalies

Abstract. It is well established that earthquakes and volcanic eruption can produce small variations in the local geomagnetic field. The Italian Istituto Nazionale di Geofisica e Vulcanologia (INGV) tectonomagnetic network was installed in Central Italy since 1989 to investigate possible effects on the local geomagnetic field related to earthquakes occurrences. At the present time, total geomagnetic field intensity data are collected in four stations using proton precession magnetometers. We report the complete dataset for the period of years 2004–2005. The data of each station are differentiated respect to the data of the other stations in order to detect local field anomalies removing the contributions from the other sources, external and internal to the Earth. Unfortunately, no correlation between geomagnetic anomalies and the local seismic activity, recorded in Central Italy by the INGV Italian Seismic National Network, was found in this period. Some deceptive structures present in the differentiated data are pointed out.

scholarly journals The combined processing of geomagnetic intensity vector projections and absolute magnitude measurements

2019 ◽  
Vol 8 (2) ◽  
pp. 209-215
Author(s):  
Victor G. Getmanov ◽  
Alexei D. Gvishiani ◽  
Roman V. Sidorov
Keyword(s):  
Field Intensity ◽  
Geomagnetic Field ◽  
Absolute Magnitude ◽  
Statistical Modelling ◽  
Local Approximation ◽  
Processing Algorithm ◽  
Intensity Vector ◽  
Geomagnetic Field Intensity ◽  
Absolute Magnitudes ◽  
Geomagnetic Intensity

Abstract. A method for the combined processing measurements of the projections and the absolute magnitudes of geomagnetic field intensity vectors, based on mathematical technology of local approximation models, is proposed. The approach realized in this paper, based on the proposed method, provides an increase in quality of the measurements of the projections of the geomagnetic intensity vector. An algorithm for the two-stage combined processing of the measurements of projections and absolute magnitudes of geomagnetic field intensity vectors is developed. The operation of the combined processing algorithm was tested on models and observatory measurements. The estimates of the combined processing algorithm errors were obtained using statistical modelling. The reduction of the root-mean-square error values was achieved for the estimates of the projections of geomagnetic field intensity vectors.

Absolute geomagnetic intensity determinations on Formative potsherds (1400–700 BC) from the Oaxaca Valley, Southwestern Mexico

2012 ◽  
Vol 78 (3) ◽  
pp. 442-453 ◽  
Author(s):  
Marie Pétronille ◽  
Avto Goguitchaichvili ◽  
Juan Morales ◽  
Claire Carvallo ◽  
Yuki Hueda-Tanabe
Keyword(s):  
Field Strength ◽  
Geomagnetic Field ◽  
Master Curve ◽  
Global Models ◽  
Significant Evidence ◽  
Absolute Intensities ◽  
Geological Features ◽  
The Absolute ◽  
Geomagnetic Field Strength ◽  
Geomagnetic Intensity

AbstractNew Thellier-Coe archeointensity determinations have been measured on 15 potsherds from the Oaxaca Valley belonging to three of the four Formative Periods (Pre-Classical) of Mesoamerica, spanning 1400–700 BC. Seven of these are considered to be reliable and indicate a geomagnetic field strength of about 30 μT. This value is some 75% of the present geomagnetic field strength but is in agreement with the absolute intensities predicted from global models for this time and location, and consistent with coeval published determinations. These data thus provide significant evidence for the geomagnetic field strength in an area and for a time that was previously poorly constrained, thus providing an important contribution towards establishing a local master curve for the last 3500 yr. When established, such a curve would be a useful dating tool and also enable establishing for field strength correlations with climatic events and civilization evolutions in a region that is particularly strong in archeological and geological features. Such potential is examined for aridity events, although such observations can only be considered tentative at this stage.

scholarly journals The combined processing of geomagnetic intensity vector projections and absolute magnitude measurements

2018 ◽  
Author(s):  
Victor G. Getmanov ◽  
Alexei D. Gvishiani ◽  
Roman V. Sidorov
Keyword(s):  
Field Intensity ◽  
Geomagnetic Field ◽  
Absolute Magnitude ◽  
Statistical Modelling ◽  
Local Approximation ◽  
Processing Algorithm ◽  
Intensity Vector ◽  
Geomagnetic Field Intensity ◽  
Absolute Magnitudes ◽  
Geomagnetic Intensity

Abstract. A method for the combined processing measurements of the projections and the absolute magnitudes of geomagnetic field intensity vectors, based on mathematical technology of local approximation models, was proposed. The approach realized in this paper, based on the proposed method, provides the increase of accuracy of the measurements of the projections of the geomagnetic intensity vector. An algorithm for the two-stage combined processing of the measurements of projections and absolute magnitudes of geomagnetic field intensity vectors was developed. The operation of the combined processing algorithm was tested on models and observatory measurements. The estimates of the combined processing algorithm errors were obtained using statistical modelling. The reduction of the root mean square error values was achieved for the estimates of the projections of geomagnetic field intensity vectors.

scholarly journals The INGV tectonomagnetic network

2008 ◽  
Vol 14 ◽  
pp. 65-68 ◽  
Author(s):  
F. Masci ◽  
P. Palangio ◽  
M. Di Persio
Keyword(s):  
Magnetic Field ◽  
Geomagnetic Field ◽  
Magnetic Field Intensity ◽  
Central Italy ◽  
Magnetic Anomalies ◽  
Data Sets ◽  
Intensity Data ◽  
Geomagnetic Observatory ◽  
Data Set ◽  
Latitude Range

Abstract. The Italian Istituto Nazionale di Geofisica e Vulcanologia (INGV) tectonomagnetic network was installed in Central Italy since the middle of 1989 to investigate possible magnetic anomalies related to earthquakes. The network is part of the INGV L'Aquila Geomagnetic Observatory and is located in an area extending approximately in latitude range [41.6°–42.8°] N and longitude range [13.0°–14.3°] E. Actually the network consists of four stations where the total magnetic field intensity data are collected using proton precession magnetometers. New stations will be added to the network starting from the end of 2007. Here we are reporting the whole data set of the network's stations for the period 2004–2006. No significant anomaly in the local geomagnetic field correlated to the seismic activity has been found. Some considerations about misleading structures present in the data sets are reported.

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