Courses

A passive seismic conference has been held in partnership with our local representative, Wings Technology Enterprise.

The conference aimed to impart significant knowledge on the passive seismic technique and the uses of this geophysical exploration method in the geological and civil engineering industries. The global geological context of the Philippines is very varied and the country is subjected to many natural hazards (earthquakes, landslide …). The use of our instruments could obviously be of great help for the subsoils characterization but also for monitoring their cities which are under permanent construction.

We hosted a delegation of scientists and technicians from Ghana for a training course on our instruments for geophysical exploration. A few days of technical seminars, field surveys and also some leisure time in the beautiful town of Venice.

Orange Lamp (Beijing) is a new MoHo representative in China. Orange Lamp received a specific training course on all MoHo instruments at our headquarter in Venice (Italy) and is now ready to start working with us!

TROMINO^® class organized by Exploration Instruments in Harrisburg (PA, USA)

Passive seismic methods: Theory and main applications (2h)

The characteristics of seismic noise have been studied since long ago (the first studies by Ben Gutenberg are dated 1950, as an example). However, the practical applications of these studies are more recent. In the first part of the seminar we will review the history of the so-called passive-seismic approches and their actual use and interpretation in the geological and civil engineering practice. We will process some data by using the software Grilla.

 HVSR and dispersion complementarity + Field tests (3h)

A variety of multichannel active and passive seismic techniques (SASW, MASW, ReMi^TM, SPAC, ESAC etc.) aim at retrieving the surface-wave dispersion curve  of the subsoil. This is closely linked to the shear wave velocity profile (Vs) and has therefore important geotechnical applications.  In the second part of the seminar we review the common ideas at the basis of these techniques, the difference and the advantages/disadavantages of all of them.

Finally, we will review the huge benefits deriving from the combined use of the single station and the multichannel approaches.

From November 4^th to November 12^th 2018 MoHo will be in Chile, at the Universidad Andrés Bello,  at the IDIEM Universidad de Chile and at some private companies, for some workshops and trainings on the single station and multichannel seismic techniques dedicated to the dynamic characterization of soils and structures in seismic prone areas  and beyond.

QUEBEC (CANADA) – NOV. 17^th 2017: Campus of the Laval University: Open course addressed to both students and professionals [in French]. Title: Introduction à l’analyse des ondes de surface pour l’ingénieur (sismique active et passive)

HVSR : Historique, Théorie et principales applications

L’étude du bruit de fond sismique existe depuis le début du 20eme siècle et est de nos jours utilisée dans de nombreux domaines. Nous allons donc revoir les principales caractéristiques de cette méthode et comment interpréter une courbe HV d’un point de vue géologique. Nous passerons rapidement en revue toute ses possibles applications, tant dans le domaine de la géologie que de l’ingénierie civile. Nous verrons finalement quelques cas d’étude grâce au logiciel d’interprétation Grilla.

La complémentarité de la courbe de dispersion et de l’HVSR

De nombreuses entreprises de géophysique/géotechnique utilisent les méthodes MASW, ReMi, ou ESAC pour étudier la dispersion des ondes de surface afin d’obtenir leur fameuse courbe de dispersion. Par le biais d’un logiciel d’inversion, cette courbe de dispersion permettra de caractériser le sous-sol (profile de vitesse d’onde S). Un rappel sur les principales techniques d’analyse d’ondes de surface sera fait et nous étudierons comment la technique HVSR aide à correctement déployer la sismique multicanale mais aussi à améliorer notre interprétation finale du sous-sol. Ces deux techniques présentent plus de possibilités lorsqu’elles sont utilisées de façon combinée que séparément.  Nous finirons le cours en observant d’autres cas d’étude avec Grilla.

PERTH (AUSTRALIA) – OCT. 12-13th 2017: a two-day introduction on surface wave seismic methods has been held in Perth (Australia). The course introduced the basic principles of the modern active and passive, single-station and multichannel seismic methods.

A one day workshop on ‘Near surface passive seismic surveying for mineral exploration, environmental and engineering applications’ was presented on the Saturday before the 2016 ASEGAIG-PESA conference and was organised by Jayson Meyers and Chris Wijns.
A summary of the day can be found in the attachment.

On Nov. 15-18th 2016 a course on passive seismic techniques with arrays of Tromino^® was given at the National Institute of Geophysics in Beijing (China) and at the Institute of Karst Geology in Guilin (China, picture on the left).

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A workshop entirely devoted to the single-station passive method for the mining prospection was organized by the Australian MoHo’s distributor (Resource Potentials) and MoHo within the 25th ASEG-PESA-AIG conference (http://www.conference.aseg.org.au/workshops.html#w8).

The course was a nice opportunity to discuss successful applications and problems of the H/V prospection to the mining field in terms of, e.g., the determination of the regolith thickness.