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Drag-out effect of piezomagnetic signals due to a borehole:the Mogi source as an example
piezomagnetic effect borehole magnetic measurement the Mogi model Long Valley
2015/9/2
We show that using borehole measurements in tectonomagnetic experiments allows enhancement of the observed signals. New magnetic dipoles, which vary with stress changes from mechanical sources, are pr...
Rapid neuronet inversion of 2D magnetotelluric data for monitoring of geoelectrical section parameters
magnetotelluric inverse problem neural network EM monitoring
2015/9/2
The inverse MagnetoTelluric (MT) operator is approximated by means of the Neural Network (NN). The methodology of the NN interpretation in classes of the geoelectrical sections described by the hundre...
Anomalous geoelectrical and geomagnetic signals observed at Southern Boso Peninsula,Japan
ULF electromagnetic environment geoelectrical potential differences direction of signal arrival understanding the preparation process of crustal activity
2015/9/2
Geoelectrical and geomagnetic fluctuations are considered the end product of several geophysical phenomena. In particular these signals measured in seismically active areas can be attributed to stress...
Shallow to intermediate resistivity features of the Colfiorito Fault System inferred by DC and MT survey
Colfiorito fault system magnetotellurics geoelectrics fluids
2015/9/1
Over the last decade electromagnetic (EM) measurements have provided new constraints on the upper-crustal structure of the major fault zones in the world, both when they act as conduit and as a barrie...
A new station for monitoring electromagnetic fields in Duronia (Italy):experimental setup and first results
geomagnetic field MEM project Schumann resonance Ionospheric Alfven Resonator
2015/8/28
Since the end of 2007 a new electromagnetic field monitoring station has been in operation in Central Italy in the area of a village called Duronia. The station was created in the framework of the MEM...
Environmental magneto-gradiometric marine survey in a highly anthropic noisy area
environmental reclamation anthropic noise magneto-gradiometric survey
2015/8/28
We describe a magneto-gradiometric survey performed in the «Mar Piccolo» of Taranto, Italy in May 2005 for environmental purposes. This region, which is a noisy harbour environment, provides...
Revised comparison and analysis of severe magnetic storm effects measured over Istanbul and Rome
radio propagation geomagnetic and ionospheric storm
2015/8/28
Geomagnetic Storms (GS) and Ionospheric Storms (IS) for high geomagnetic activity conditions are studied in Istanbul (IST) and in Rome (RO). Further and revised results that led to new interpretations...
Four decades of European geomagnetic secular variation and acceleration
European secular variation secular acceleration geomagnetic jerks
2015/8/28
Geomagnetic secular variation, the generally slow, continuous change in the core magnetic field, is characterized by occasional rapid variations known as geomagnetic jerks. Recent studies on magnetic ...
The Tres Tabernae archeological site (Cisterna di Latina, Italy): new evidence revealed through an integrated geophysical investigation
Archaeology GPR Frequency Domain Electromagnetic Induction Magnetic survey buried remains
2015/8/28
«Mercator» (Medocc, INTERREG IIIB) is a European project that is aimed at a detailed investigation of the historical and archeological heritage of the Mediterranean area. Within this project...
Global nonlinear optimization for the estimation of static shift and interpretation of 1-D magnetotelluric sounding data
Magnetotelluric sounding global nonlinear optimization static shift TE and TM mode apparent resistivity phase
2015/8/27
In the presence of conducting inhomogeneities in near-surface structures, apparent resistivity data in magnetotelluric sounding can be severely distorted. This is due to electric fields generated from...
K-type geomagnetic index nowcast with data quality control
geomagnetic activity index real-time computing nowcast system
2015/8/27
A nowcast system for operational estimation of a proxy K-type geomagnetic index is presented. The system is based on a fully automated computer procedure for real-time digital magnetogram data acquisi...
Magnetic Declination Chart 2006 of Europe–produced by the MagNetE Group
Main geomagnetic field Global and regional models Magnetic anomalies Instruments and techniques Data processing
2015/8/26
During its 4th Workshop in Helsinki in 2009 the Group for European Repeat Station Surveys, MagNetE, decided to produce a European Declination Chart 2006 which is based on the numerous magnetic repeat ...
How to control a temporary DIDD based observatory in the field?
Instruments and techniques Main geomagnetic field Geomagnetic field variations and reversals Magnetic anomalies Magnetic storms Main geomagnetic field
2015/8/26
One of the main challenges on the course of the repeat station surveys is to determine the spatial differences of the geomagnetic elements between the repeat stations and the reference observatory. Th...
Comparison of the reference mark azimuth determination methods
Geodetic (ellipsoidal) azimuth Astronomic azimuth Repeat station Reference mark GNSS CROPOS
2015/8/26
The knowledge of the azimuth of the reference mark is of crucial importance in the determination of the declination which is defined as the ellipsoidal (geodetic) azimuth of the geomagnetic meridian. ...
Secular variation on the territory of the Czech Republic and reduction of the magnetic survey to the epoch 2010.5
Magnetis survey Secular variation Repeat stations
2015/8/26
A recent stage of the magnetic surveying activities in the Czech Republic was started in the fifties by setting up a basic network of the first order. It consists of 199 points. Complete measurements ...