Evaluating seismic source mechanism with phasor analysis

2012 ◽  
Vol 2 (1) ◽  
pp. 3-7
Author(s):  
M. Hudyma ◽  
D. Beneteau ◽  
Y. Potvin
Keyword(s):  
Seismic Source ◽  
Source Mechanism ◽  
Seismic Source Mechanism ◽  
Phasor Analysis

Estimation of rockburst wall-rock velocity invoked by slab flexure sources in deep tunnels

2014 ◽  
Vol 51 (5) ◽  
pp. 520-539 ◽  
Author(s):  
Shili Qiu ◽  
Xiating Feng ◽  
Chuanqing Zhang ◽  
Tianbing Xiang
Keyword(s):  
Rock Mass ◽  
Seismic Source ◽  
Friction Angle ◽  
Wall Rock ◽  
Assessment Method ◽  
Source Mechanism ◽  
Uniaxial Tensile ◽  
Roughness Coefficient ◽  
Support Design ◽  
True Triaxial

For rock support in burst-prone ground, the wall-rock velocity adjacent to the surface of underground openings is a vital support design parameter, and depends on the seismic source mechanism inducing rockburst damage. In this study, to estimate the wall-rock velocity evoked only by rock slab buckling (an important rockburst source mechanism), a comprehensive velocity assessment method is proposed, using an excellent slab column buckling model with a small eccentricity, which relies on a novel compressive or tensile buckling failure criterion of rock slab. The true-triaxial loading–unloading tests and rockburst case analyses reveal that rock mass slabbing induced by high rock stress has major impacts on the evolution and formation of buckling rockburst in deep tunnels. Using a method based on the energy balance principle, the slabbing thickness of intact rock mass is also calculated by an analytical method, which indicates that the slabbing thickness parameter has a nonlinear relation to the following six parameters: uniaxial tensile strength (UTS), uniaxial compressive strength (UCS), normal stress (σn), length of joint (L), friction angle ([Formula: see text]), and joint roughness coefficient (JRC). These proposed models and methods have been quite successfully applied to rockburst and slabbing cases occurring in deep tunnels. These applications show that slab flexure is an important source mechanism invoking high wall-rock velocities and leading to severe rockburst damages in the area surrounding deep tunnels.

Stick-slip propagation velocity and seismic source mechanism

1972 ◽  
Vol 62 (6) ◽  
pp. 1621-1628 ◽  
Author(s):  
Francis T. Wu ◽  
K. C. Thomson ◽  
H. Kuenzler
Keyword(s):  
Propagation Velocity ◽  
Growth Process ◽  
Seismic Source ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Stick Slip ◽  
Two Dimensional Model ◽  
Seismic Source Mechanism ◽  
Fault Growth ◽  
Limiting Value

abstract Earthquakes, at least the shallow ones, take place along pre-existing fault planes. The controlling factor is, therefore, friction, and the fault growth process resembles that of stick-slip propagation. We have simulated this process in a two-dimensional model. It is found that propagation velocity can range from sub-shear to 1.1 Vs (the latter is not a limiting value).

The determination of source properties by the linear inversion of seismograms

1977 ◽  
Vol 67 (6) ◽  
pp. 1489-1502
Author(s):  
Brian W. Stump ◽  
Lane R. Johnson
Keyword(s):  
Moment Tensor ◽  
Seismic Source ◽  
Source Mechanism ◽  
Linear Inversion ◽  
Fault Plane Solutions ◽  
Direct Inversion ◽  
Yield Information ◽  
Time Domains ◽  
Force Moment ◽  
The Time Domain

abstract A method has been developed allowing the direct inversion of seismograms to obtain an estimate of the seismic source, as characterized by its equivalent force moment tensor. With reasonable assumptions the problem can be shown to be linear in both the frequency and time domains and least-squares methods are used to estimate the source mechanism. In the synthetic tests that have been run, several possible uses of the method have been investigated. With a satisfactory station distribution the source mechanism can be recovered using complete seismograms from three component stations or several P arrivals on vertical components. The method is useful in distinguishing multiple events including explosions. The errors of the fits are determined in the procedure and yield information such as the bandwidth of useful data in the frequency domain and error estimates for fault-plane solutions in the time domain fits.

Correction to "Ascending seismic source during an explosive eruption at Tungurahua volcano, Ecuador”

2011 ◽  
Author(s):  
Hiroyuki Kumagai ◽  
Pablo Placios ◽  
Mario Ruiz ◽  
Hugo Yepes ◽  
Tomofumi Kozono
Keyword(s):  
Explosive Eruption ◽  
Seismic Source ◽  
Tungurahua Volcano
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