mopad — Moment Tensor Plotting and Decomposition: A Tool for Graphical and Numerical Analysis of Seismic Moment Tensors
mopad — Moment Tensor Plotting and Decomposition: A Tool for Graphical and Numerical Analysis of Seismic Moment Tensors
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DOI：
10.1785/gssrl.83.3.589
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发表时间：
2012-05
影响因子：
3.3
通讯作者：
L. Krieger;S. Heimann
中科院分区：
文献类型：
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作者：
L. Krieger;S. Heimann
在线资料：软件源代码；的例子;样的情节。焦点机制的图形表示是焦点球上的辐射图（有时称为“沙滩球图”），这是很好的方法。它由以地震事件震源点为中心的单位球上的球面投影组成。P波辐射模式的标志显示为球体上的彩色区域（如Udias 1999； Stein and Wysession 2003; Crotin 2004）。对于平面上的纯剪切运动，焦球可以用该断层面的走向角、倾角和滑倾角来充分描述（cf, Shearer 1999; Aki and Richards 2002）。在这种情况下，球面投影到r2的构造是直接的（例如，Stein和Wysession 2003，第5章）。有几个工具可用于完成这项工作。它们或多或少作为可配置的独立软件包存在（Snoke 2003； Srivastava等人2006；Luis 2007； Haeussler和Labay 2007），或作为GMT、MATLAB （Creager 1997；地震研究和信息中心2008）或Mathematica （Scherbaum等人2010）的补充，或作为在线小程序存在（Helffrich 2007）。几乎所有现有的软件都只考虑这些纯剪切裂缝。更复杂的震源机制的可视化，例如，具有六个独立分量的任意地震矩张量，通常是不可能的。只有少数工具能够处理这种一般情况。最常用的是GMT中的psmeca工具（Wessel and Smith 1999）。然而，psmeca无法对任意视点进行投影。我们提供了免费的独立于平台的命令行工具MoPaD，它是用Python编程语言编写的，允许一个…
Online material: Software source code; examples; sample plots. The graphical representation of a focal mechanism as a plot of the radiation pattern on the focal sphere (sometimes referred to as “beachball diagram”) is well established. It consists of a spherical projection on a unit sphere centered at the source point of a seismic event. The sign of the P -wave radiation pattern is shown as colored areas on the sphere (as described, e.g. , by Udias 1999; Stein and Wysession 2003; and Crotin 2004). For pure shear motion on a plane, the focal sphere may be fully described by the angles of strike, dip, and slip-rake of this fault plane ( cf. , Shearer 1999; Aki and Richards 2002). In this case the construction of the spherical projection into the R 2 is straightforward ( e.g. , Stein and Wysession 2003, chapter 5). Several tools are available to do this work. They exist either as a more or less configurable, independent software package (Snoke 2003; Srivastava et al. 2006; Luis 2007; Haeussler and Labay 2007), as supplements for GMT, MATLAB (Creager 1997; Center for Earthquake Research and Information 2008) or Mathematica (Scherbaum et al. 2010), or as an online applet (Helffrich 2007). Almost all of the existing software consider only these pure shear cracks. The visualisation of a more complex source mechanism, e.g. , an arbitrary seismic moment tensor with six independent entries, is often not possible. Only a few tools exist at all that can handle this general case. The most commonly used one is the psmeca -tool in GMT (Wessel and Smith 1999). However, projections for arbitrary viewpoints are not possible with psmeca . We present the free platform-independent command line tool MoPaD , written in the Python programming language that allows one …