Abstract A vast amount of analogue seismograms recorded between the end nineteenth century and late twentieth are often inaccessible for seismological research since they not available as digital time series. This manuscript describes freely software, DigitSeis, that takes a image an seismic record returns waveforms either function their x-y position on or time–amplitude information. The overal...

Abstract Indonesia has high level of seismic activity, so determining magnitude an earthquake is important in the Earthquake Early Warning System. In System, parameter must be estimated earlier, that warnings can disseminated before S and surface waves arrive. previous studies machine learning technology used to recognized events extract hidden information with massive datasets. This study was ...

The Potwar sub-basin is an important hydrocarbon producing zone of the Upper Indus basin and has significant oil gas potential. Balkassar area main field mainly produced from Eocene carbonates. Chorgali Formation age reservoir rock in this area. Structurally, complicated, surface features often do not reflect subsurface structures. This due to presence detachments at different levels. In such c...

As a mean to assess the risk dam structures are exposed during earthquakes, we employ an abstract mathematical, three dimensional, elasto-acoustic coupled wave-propagation model taking into account (i) structure itself, embedded (ii) its surrounding topography, (iii) different material soil layers, (iv) seismic source as well (v) reservoir lake filled with water treated acoustic medium. case st...

In this paper we approach the problem of recovering the earth’s impulse response and the seismic wavelets used to probe the earth by the use of techniques inspired in blind equalization methods developed for digital communication systems. We present a recently proposed class of algorithms to recover, by seismogram observation only, both amplitude and phase of the seismic wavelets and the earth’...

CWI's research has a theme-oriented structure and is grouped into four clusters. Listed below are the names of the clusters and in parentheses their acronyms. 1. INTRODUCTION A feature of a seismic earthquake signal is that it is built up by several different seismic waves, characterizing the type of signal. In this paper we are only interested in two of these waves, namely the primary wave (P-...

[1] We study the scaling relationships of source parameters and the self-similarity of earthquake spectra by analyzing a cluster of over 400 small earthquakes (ML = 0.5 to 3.4) recorded by the Anza seismic network in southern California. We compute P, S, and preevent noise spectra from each seismogram using a multitaper technique and approximate source and receiver terms by iteratively stacking...

Long-period surface waves recorded on the north-south Pasadena strainmeter are used to determine the seismic moments and fault parameters of the 19 May 1940 Imperial Valley, California, the 16 December 1954 Dixie Valley and Fairview Peak, Nevada, and the 18 August 1959 Hebgen Lake, Montana, earthquakes. Synthetic strain seismograms are matched with the observed strainmeter seismograms. Source p...

Recordings of the Earth's surface oscillation as a function of time (seismograms) can be sonified by compressing time so that most of the signal's frequency spectrum falls in the audible range. The patternrecognition capabilities of the human auditory system can then be applied to the auditory analysis of seismic data. In this experiment, we sonify a set of seismograms associated with a magnitu...

Marc Schoenauer1, Andreas Ehinger2 and Bertrand Braunschweig3 (1) : CMAP, CNRS-URA 756, Ecole Polytechnique, Palaiseau, France (2) : Geophysics and Instrumentation, IFP, Pau, France (3) : Computer Science and Applied Mathematics, IFP, Rueil-Malmaison, France E-mails : [email protected], fandreas.ehinger,[email protected] Abstract Many problems to be solved in geophysi...