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

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Table of Content INTRODUCTION.............................................................................................................. 3 CHAPTER I .......................................................................................................................4 What’s going on with this earthquake catalog? Which parts are useful? What scientific problems can be tackled?............................................................................. 4 CHAPTER II.................................................................................................................... 14 Are there serious problems with heterogeneous reporting in a catalog? What is the starting time of the high-quality data? ............................................................... 14 CHAPTER III .................................................................................................................. 22 Measuring Changes of Seismicity Rate..................................................................... 22 Comparing two periods for rate changes .................................................................. 28 Articles in which tools discussed in this chapter were used:.................................... 33 CHAPTER IV................................................................................................................... 34 Measuring Variations in b-value ............................................................................... 34 CHAPTER V .................................................................................................................... 41 Stress Tensor Inversions............................................................................................. 41 Introduction............................................................................................................... 41 Data Format .............................................................................................................. 41 Plotting focal mechanism data on a map .................................................................. 42 Inverting for the best fitting stress tensor. ................................................................ 43 Inverting on a grid..................................................................................................... 44 Plotting stress results on top of topography.............................................................. 46 Using Gephart’s code................................................................................................ 47 The cumulative misfit method .................................................................................. 49 References................................................................................................................. 52 CHAPTER VI................................................................................................................... 54 Importing data into ZMAP........................................................................................ 54 ASCII columns – the most simple way..................................................................... 54 Other options to import your data: Writing your own import filters ........................ 55 CHAPTER VII ................................................................................................................. 57 Tips an tricks for making nice figures ...................................................................... 57 Editing ZMAP graphs............................................................................................... 57 Exporting figures from ZMAP.................................................................................. 60 Working with interpolated color maps ..................................................................... 63 2
INTRODUCTION This cookbook is aimed at entry level and experienced users of ZMAP. It described typical applications of ZMAP to seismicity analysis. By giving enough detail on both the scientific objective and the mechanics of using ZMAP as a tool for seismicity analysis, we hope to provide users will a helpful document beyond the customary manual and online help. Note that the cookbook assumes some familiarity with basic ZMAP functions (starting ZMAP, loading catalogs, etc.), which are described in the First Steps manual. (./help/firststeps.htm). This cookbook is provided as PDF file for easy viewing and printing, and as a HTML document for online browsing. Since ZMAP is continually developing, not all windows may look in your ZMAP version just like show here. We tried to make this manual as useful and error-free as possible while keeping the time required to produce within tolerable bound (we do like to do science more than writing documentation). As always in ZMAP: No guaranties, feedback is welcome! Max Wyss and Stefan Wiemer 08/2001 3
Page 1: ZMAP A TOOL FOR ANALYSES OF SEISMIC
Page 5 and 6: Figure 2: Seismicity map of the ent
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Page 9 and 10: Narrowing the target of investigati
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Page 13 and 14: Articles in which tools discussed i
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Page 21 and 22: cumulative number curve for M>1. ev
Page 23 and 24: Second: One may want to know the am
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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 and 44: Inverting for the best fitting stre
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Page 47 and 48: Using Gephart’s code An alternati
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Lu, Z., M. Wyss, and H. Pulpan, Det
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• First rename mydata into a: a =
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CHAPTER VII Tips an tricks for maki
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Now lets change the axes setup. Sel
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Alternatively, you can print from t
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Working with interpolated color map
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