zmap a tool for analyses of seismicity patterns typical applications ...

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Figure 5.4: Stress tensor inversion results plotted as a function of time Inverting on a grid From the seismicity window, the ZTOOLS -> Map stress tensor option will open an input window for the inversion on a grid. The input structure is similar to the b- and z-value mapping. Grids node spacing is degrees. You can either choose a constant number near each node, or a constant radius in kilometer. When choosing the latter. it might be a good idea to set the minimum number of events to a value above its default of zero (e.g., 10). A grid is defined interactively, excluding areas of low seismicity (left mouse: new node; right mouse button: last node). Results of the inversion are displayed in two windows: A map that sows the orientation 44
of S1 as a bar, and color codes the faulting style, and a map of the variance of the inversion at each node, under laying again the orientation of S1 indicated by bars. Figure 5.5: Stress tensor inversion results for the Landers region/ Th etop frame shows the orientatio of S1 (bars), differentiating various faulting regimes. The Bottom plot shows in addition the variance of the stress tensor at each node. Red areas are regions where only a poor fit to a homogeneous stress tensor could be obtained. The Select -> Select EQ in circle option will plot the cumulative number at this node, then perform an inversion and plot the results in a wulff net. 45
Page 1 and 2: ZMAP A TOOL FOR ANALYSES OF SEISMIC
Page 3 and 4: INTRODUCTION This cookbook is aimed
Page 5 and 6: Figure 2: Seismicity map of the ent
Page 7 and 8: Save new mat-file: At this point it
Page 9 and 10: Narrowing the target of investigati
Page 11 and 12: Figure 11: Resolution map with the
Page 13 and 14: Articles in which tools discussed i
Page 15 and 16: Figure 2.2: Genas1 window. The cumu
Page 17 and 18: Figure 2.5: Comparison of the rates
Page 19 and 20: this case, the routine found that a
Page 21 and 22: cumulative number curve for M>1. ev
Page 23 and 24: Second: One may want to know the am
Page 25 and 26: Figure 3. 5: Z-menu window. Choosin
Page 27 and 28: each node and calculates for every
Page 30 and 31: Again the grid is chosen by using t
Page 33 and 34: Articles in which tools discussed i
Page 35 and 36: Figure 4.2: b-value maps of souther
Page 37 and 38: Figure 4.5: (a) Magnitude of comple
Page 39 and 40: Changes of b-values as a function o
Page 41 and 42: CHAPTER V Stress Tensor Inversions
Page 43: Inverting for the best fitting stre
Page 47 and 48: Using Gephart’s code An alternati
Page 49 and 50: #define VARIANCE_30 30 change to: #
Page 51 and 52: depicts the misfit value f. Please
Page 53 and 54: Lu, Z., M. Wyss, and H. Pulpan, Det
Page 55 and 56: • First rename mydata into a: a =
Page 57 and 58: CHAPTER VII Tips an tricks for maki
Page 59 and 60: Now lets change the axes setup. Sel
Page 61 and 62: Alternatively, you can print from t
Page 63: Working with interpolated color map

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