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| Author | : John Ristau |
| Publisher | : |
| Total Pages | : 22 |
| Release | : 2016 |
| Genre | : Seismology |
| ISBN | : 9780947510831 |
| Author | : Alice-Agnes Gabriel |
| Publisher | : Frontiers Media SA |
| Total Pages | : 185 |
| Release | : 2023-05-09 |
| Genre | : Science |
| ISBN | : 2832523056 |
| Author | : Lawrence R. Wamboldt |
| Publisher | : |
| Total Pages | : 374 |
| Release | : 2012 |
| Genre | : |
| ISBN | : |
A study was undertaken to evaluate an automated process to invert for seismic moment tensors from seismic data recorded in mining environments. The data for this study was recorded at Nickel Rim South mine, Sudbury, Ontario. The mine has a seismic monitoring system manufactured by ESG Solutions that performs continuous monitoring of seismicity. On average, approximately 400 seismic events are recorded each day. Currently, data are automatically processed by ESG Solution's software suite during acquisition. The automatic processors pick the P- and/or S-wave arrivals, locate the events and solve for certain source parameters, excluding the seismic moment tensor. In order to solve for the moment tensor, data must be manually processed, which is laborious and therefore seldom performed. This research evaluates an automatic seismic moment tensor inversion method and demonstrates some of the difficulties (through inversions of real and synthetic seismic data) of the inversion process. Results using the method are also compared to the inversion method currently available from ESG Solutions, which requires the manual picking of first-motion polarities for every event. As a result of the extensive synthetic testing of the automatic inversion program, as well as the inversion of real seismic data, it is apparent that there are key parameters requiring greater accuracy in order to increase the reliability of the automation. These parameters include the source time function definition, source location (in turn requiring more accurate and precise knowledge of the earth media), arrival time picks and an attenuation model to account for ray-path dependent filtering of the source time function. In order to improve the automatic method three key pieces of research are needed: (1) studying various location algorithms (and the effects of increasing earth model intricacy) and automatic time picking to improve source location methods, (2) studying how the source time pulse can be accurately extracted from the seismic records, as well as the validity of various source models, and (3) studying how attenuation can be modeled more accurately to account for the filtering of the seismic waves through the earth media (in particular distortion to the source time function).
| Author | : |
| Publisher | : |
| Total Pages | : 10 |
| Release | : 2000 |
| Genre | : |
| ISBN | : |
We are porting automatic seismic moment tensor software used by the Berkeley Seismological Laboratory to the Prototype International Data Center (PIDC). This software package utilizes a surface wave spectral amplitude and phase method coupled with a three-component waveform inverse method that is scaleable from teleseismic to regional distances. The objective is to initially develop automatic software for the analysis of Mw5.5 and greater events on a global scale utilizing the International Monitoring System (IMS). For regions of specific interest we will utilize crustal structure calibration information from other DTRA projects to refine capabilities to Mw4.5 and greater. Currently version 0.1 is ported to the PIDC, and several examples of its use are presented. During the course of this project a staged testing program will be employed to refine the software and to provide robust code suitable for operations at the PIDC.
| Author | : Sebastiano D'Amico |
| Publisher | : Springer |
| Total Pages | : 751 |
| Release | : 2018-05-12 |
| Genre | : Science |
| ISBN | : 3319773593 |
This book first focuses on the explanation of the theory about focal mechanisms and moment tensor solutions and their role in the modern seismology. The second part of the book compiles several state-of-the-art case studies in different seismotectonic settings of the planet.The assessment of seismic hazard and the reduction of losses due to future earthquakes is probably the most important contribution of seismology to society. In this regard, the understanding of reliable determination seismic source and of its uncertainty can play a key role in contributing to geodynamic investigation, seismic hazard assessment and earthquake studies. In the last two decades, the use of waveforms recorded at local-to-regional distances has increased considerably. Waveform modeling has been used also to estimate faulting parameters of small-to-moderate sized earthquakes.
| Author | : Jens Havskov |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 350 |
| Release | : 2010-06-16 |
| Genre | : Science |
| ISBN | : 9048186978 |
The purpose of this book is to get a practical understanding of the most common processing techniques in earthquake seismology. The book deals with manual methods and computer assisted methods. Each topic will be introduced with the basic theory followed by practical examples and exercises. There are manual exercises entirely based on the printed material of the book, as well as computer exercises based on public domain software. Most exercises are computer based. The software used, as well as all test data are available from http://extras.springer.com. This book is intended for everyone processing earthquake data, both in the observatory routine and in connection with research. Using the exercises, the book can also be used as a basis for university courses in earthquake processing. Since the main emphasis is on processing, the theory will only be dealt with to the extent needed to understand the processing steps, however references will be given to where more extensive explanations can be found. Includes: • Exercises • Test data • Public domain software (SEISAN) available from http://extras.springer.com
| Author | : Robert Hall |
| Publisher | : Geological Society of America |
| Total Pages | : 592 |
| Release | : 1996 |
| Genre | : Science |
| ISBN | : |
The papers in this volume explore the tectonic evolution of south-eastern Asia
| Author | : Subir Ghosh |
| Publisher | : CRC Press |
| Total Pages | : 456 |
| Release | : 1996-09-26 |
| Genre | : Technology & Engineering |
| ISBN | : 9780824797638 |
Explains the role of statistics in improving the quality of collecting and analyzing information for a wide variety of applications. The book examines the function of statisticians in quality improvement. It discusses statistical process control, quality statistical tables, and quality and warranty; quality standards in medicine and public health; Taguchi robust designs and survival models; and more.
| Author | : A. Ben-Menahem |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 1127 |
| Release | : 2012-12-06 |
| Genre | : Science |
| ISBN | : 1461258561 |
Earthquakes come and go as they please, leaving behind them trails of destruc tion and casualties. Although their occurrence is little affected by what we do or think, it is the task of earth scientists to keep studying them from all possible angles until ways and means are found to divert, forecast, and eventually control them. In ancient times people were awestruck by singular geophysical events, which were attributed to supernatural powers. It was recognized only in 1760 that earthquakes originated within the earth. A hundred years later, first systematic attempts were made to apply physical principles to study them. During the next century scientists accumulated knowledge about the effects of earthquakes, their geographic patterns, the waves emitted by them, and the internal constitution of the earth. During the past 20 years, seismology has made a tremendous progress, mainly because of the advent of modern computers and improvements in data acquisi tion systems, which are now capable of digital and analog recording of ground motion over a frequency range of five orders of magnitude. These technologic developments have enabled seismologists to make measurements with far greater precision and sophistication than was previously possible. Advanced computational analyses have been applied to high-quality data and elaborate theoretical models have been devised to interpret them. As a result, far reaching advances in our knowledge of the earth's structure and the nature of earthquake sources have occurred.
| Author | : Cliffort H. Thurber |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 271 |
| Release | : 2013-11-11 |
| Genre | : Science |
| ISBN | : 9401595364 |
Advances in Seismic Event Location provides a broad overview of the fundamental issues involved in seismic event location, and presents a variety of state-of-the-art location methods and applications at a wide range of spatial scales. Three important themes in the book are: seismic monitoring for a Comprehensive Nuclear-Test-Ban Treaty (CTBT), seismic event location in three-dimensional Earth models, and methods for multiple-event location. Each chapter contains background material to help readers less familiar with the topics covered, as well as to provide abundant references for readers interested in probing deeper into a topic. However, most of the emphasis is on recent advances in methodology and their application. Audience: The book is intended primarily for academic and professional researchers and graduate students in seismology.
