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

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Figure 4.3: Frequency-magnitude distributions for quality control, comparing distributions which were judged as different in the maps. (a) Comparison of data sets with a high and a low b-value. (b) Comparison of datasets with a high and a low Mc. For all of the maps (Figures 4.2 and later) a histogram showing the distribution of the values can be plotted by selecting Histogram in the menu of Maps of the b-value map window. Figure 4.4, for example, shows the distribution of b-values based on the max. L. method. Figure 4.4: Histogram of the b-values that appear in Figure 4.2a. Important additional options in the Maps menu of the b-value map window are the mag of completeness (Figure 4.5a) map and the resolution map (Figure 4.5b). Using the information already stored in the array computed for the b-value maps (Figure 4.2) one can display the Mc. In the example (Figure 4.5a), the NE corner seems to show a higher Mc than the rest of southern California. To check if the algorithm estimates Mc correctly, one can open the Select menu and click first on Select EQ in Circle (placing the cross hairs near a brown node of Figure 4.5a), and then clicking on Select EQ in Circle (overlay existing plot), which results in the comparison of the two FMDs (Figure 4.3b). The Mc one would select by eye agrees with that estimated by the algorithm. 36
Figure 4.5: (a) Magnitude of completeness map with scale in magnitude. (b) Resolution map with scale in kilometers. The resolution map (Figure 4.5b) shows the radii necessary to sample the N events specified in the grid computation (N=100 in the example). The radius is, of course, inversely proportional to the a-value, a map of which can also be plotted using the Maps menu (not shown). The resolution map is more informative for the analyst than the avalue map, because it demonstrates how local the computed values are. From the example (Figure 4.5b), one can see that volumes along some of the edges need large radii, thus they are not worth studying. Also, near the center to the left side, one notices relatively large radii because this area contains few earthquakes. As a result of restricting the b-value plot to R
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: Figure 4.2: b-value maps of souther
Page 39 and 40: Changes of b-values as a function o
Page 41 and 42: CHAPTER V Stress Tensor Inversions
Page 43 and 44: Inverting for the best fitting stre
Page 45 and 46: of S1 as a bar, and color codes the
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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