Retrieving reflection arrivals from passive seismic data using Radon correlation
Since explosive and impulsive seismic sources such as dynamite, air guns, gas guns or even vibroseis can have a big impact on the environment, some companies have decided to record ambient seismic noise and use it to estimate the physical properties of the subsurface. Big challenges arise when the aim is extracting body waves from recorded passive signals, especially in the presence of strong surface waves. In passive seismic signals, such body waves are usually weak in comparison to surface waves that are much more prominent. To understand the characteristics of passive signals and the effect of natural source locations, three simple synthetic models were created. To extract body waves from simulated passive signals we propose and test a Radon-correlation method. This is a time-spatial correlation of amplitudes with a train of time-shifted Dirac delta functions through different hyperbolic paths. It is tested on a two-layer horizontal model, a three-layer model that includes a dipping layer (with and without lateral heterogeneity) and also on synthetic Marmousi model data sets. Synthetic tests show that the introduced method is able to reconstruct reflection events at the correct time-offset positions that are hidden in results obtained by the general cross-correlation method. Also, a depth migrated section shows a good match between imaged horizons and the true model. It is possible to generate off-end virtual gathers by applying the method to a linear array of receivers and to construct a velocity model by semblance velocity analysis of individually extracted gathers.
Download the PACIFIC project presentation https://www.pacific-h2020.eu/wp-content/uploads/PACIFIC-Project-presentation.pdf
View the PACIFIC project video PACIFIC Project on sustainable mineral exploration - YouTube
Check out our project log on Research Gate: https://www.researchgate.net/project/PACIFIC-H2020
Download PACIFIC poster presented at the American Geophysical Union (AGU) in Washington DC (10-14 December 2018)
https://www.pacific-h2020.eu/wp-content/uploads/PACIFIC-poster.pdf
All you want to know about the PACIFIC project (Passive seismic techniques for environmentally friendly and cost efficient mineral exploration) is there !
PACIFIC - H2020 research project in mineral exploration (pacific-h2020.eu)
PACIFIC develops mineral exploration techniques that have a relatively low impact on the environment. This document is an assessment of this impact, but also of the environmental footprint of all activities related to the project. PACIFIC environmental footprint is still significant because of plane travels linked to transnational meetings. Learn more about it by reading the following document.
Executive summary: This report presents two versions of the flyer produced in the framework of the PACIFIC project. Both documents are included as annexes to this deliverable and can be downloaded on PACIFIC public website: https://www.pacific-h2020.eu/media/
The project flyer is a means to introduce PACIFIC to the public and more specifically to stakeholders in the project research domain. The initial version of the PACIFIC flyer produced at the start of the project (see section 2 - first item) sums up the project objectives, background and expected results. It also includes the list of partners
involved, as well as contact details for the project. This version was printed and distributed at partners' premises and during the PACIFIC internal and external events organised in the first two years of the project.
A digital update of the PACIFIC flyer has been prepared at the beginning of the third year (see section 2 ʹsecond item) to provide further information on the challenges addressed by the PACIFIC research activities, the expected results and their expected impact on mineral exploration. The list of project partners, the logo section and the coordination team section have also been updated as required.
No recommendations