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HoliSurface®

 

"Less is more"
Ludwig Mies Van Der Rohe

 

A new software application (patented methodology) for seismic exploration via joint analysis of active and passive data obtained through acquisition procedures extremely simple and efficient fundamentally based on the smart exploitation of all the data that can be obtained through a mindful use of a single 3-component geophone (and little more).

 

What is HoliSurface®?

The software HoliSurface® employs an innovative methodology (patent granted on 01.04.2015), and has been created to fully exploit everything you can do with just one 3-component geophone: Rayleigh and Love waves Group velocities analysis (radial and vertical component) according to FVS (Full Velocity Spectrum) approach, HVSR analysis, MAAM (Miniature Array Analysis of Microtremors) analysis, Vs profile reconstruction, analysis of building vibration (DIN 4150 and UNI 9610).
The word HoliSurface® (briefly HS) is composed by Holistic and Surface and means that the purpose of the method/software is to analyze the propagation of surface waves in a complete way, namely holistic (from Greek ὅλος, "totality").
Acquiring a dataset useful for HoliSurface® analysis is not much different than traditional acquisitions of active seismic aimed, for example, at performing MASW or refraction analysis (the zero time is set by the trigger). The substantial difference is that, to perform HoliSurface® analysis, you have to use only a single 3-component geophone (3C - also said 3D because it is a geophone with three sensors oriented in three spatial orthogonal directions) whose orientation is fundamental. The key point is that the second trace of the output file must represent the radial component (namely the direction that is the axis combining/joining the source and the geophone).
To correctly perform HoliSurface® analysis will be, therefore, necessary to set the NS of the 3-component geophone radial respect to the source.

 

3D visualization of field and synthetic group-velocity spectra

 3D visualization of field and synthetic group-velocity spectra


What kind of analyses can I do with HoliSurface®?

The software HoliSurface® allows to perform different types of analysis according to both active and passive seismic methodologies:
  • MFA (Multi Filter Analysis) and HoliSurface® analysis according to Full Velocity Spectrum approach (active seismic): multi-component active seismic by using a single 3C geophone
  • Joint analysis of dispersion and HVSR (Horizontal-to-Vertical-Spectral Ratio)
  • HVSR (Horizontal to Vertical Spectral Ratio) analysis
  • MAAM (Miniature Array Analysis of Microtremors): micro-array passive seismic
  • Building Vibrational Analyses coupled and uncoupled
  • Vibrations analysis according to UNI 9614 and DIN 4150

 

Here some introductory videos about some of the HS features

 

AREA51 device for MAAM acquisitions

 AREA51 device for MAAM acquisitions

 


Where are published the methods which are implemented in HoliSurface® software application?

For new papers please regularly visit our publication area. HS users receive case studies and recommendations via newsletter


conversione Nspt-Vs
 
Nspt-Vs conversion 



HoliSurface
® from the Alps to the Moon...

Thanks to its simple acquisition procedures and the several utilities to efficiently manage the data and properly present them (handling GPS data, trace selection and filtering, vertical stack and much more), HoliSurface® has been used for the analysis of seismic data of various geological contexts: from the characterization of some sites in the Swiss Alps made for NAGRA "Nationale Genossenschaft für die Lagerung radioaktiver Abfälle" (National Cooperative for the Disposal of Radioactive Waste - Switzerland) to the analysis of seismic data collected by NASA during the Apollo Missions on the Moon (Dal Moro, EAGE Near Surface 2013, see publications).
The above photos show the Mars Rover Curiosity (courtesy of Mattel), the vehicle used for the exploration of the Red Planet.The same way as the Rover efficiently explores very remote and extreme environments, the active and passive methodologies implemented in HoliSurface® require very light and easy-to-carry equipment and limited space, but can nevertheless provide very robust subsurface models.

 

be smart, be Holi!