11. Make your
Lawrence W. Braile,
Department of Earth and
West Lafayette, Indiana
Sheryl J. Braile, Teacher
Happy Hollow School
West Lafayette, Indiana
January 17, 2002
Objective: Use the “Make Your Own Map” option in SeisVolE to create maps of earthquake and volcanic activity for selected areas. Earthquake data from additional catalogs can be selected to produce more detailed maps. Maps can be annotated with titles, a scale and city names to make the map more useful or for special purposes. The “Make Your Own Map” option also allows one to “zoom in” on a map area to see additional detail.
Instructions: The basic “Make Your Own Map” option in SeisVolE is very simple. However, there are many options for modifying the map that you have created, including adding or changing the topographic data used to generate the shaded terrain background map, selecting an alternate earthquake catalog, annotating the map, and saving the view or map image. Because using this option starts from a SeisVolE standard view and potentially involves many changes to data files used and settings, it is possible to corrupt the standard view file. To help prevent this occurrence, it is strongly recommended that you always exit from your “Make Your Own Map” view by using the Back button on the SeisVolE screen (lower left hand corner). If you do find that one or more of the SeisVolE standard views are corrupted, there are two methods of recovery that are described in Teaching Modules 1 and 3. The following section provides instructions and examples for effectively using the “Make Your Own Map” option in Seismic/Eruption.
1. Open the SeisVolE standard view with that contains your area of interest (for example, for a state in the US, open the United States view).
2. Select from the Map menu, Make Your Own Map. A dialog box will appear; click OK.
3. With the mouse, click and hold (drag) from the upper left hand corner of the area of interest to the lower right hand corner. A dialog box will appear; click Yes. The map will appear on the screen.
4. To get a better topographic background (shaded relief map) or to add topography if the screen (background) is blank, you can select an elevation file (etopo5 or topo30) if these files have been added to the TOPO folder within the SEISVOLE folder (see SeisVolE Teaching Module 1, “Downloading and Installing SeisVolE”), otherwise, go to 6.
5. Select Shaded Terrain, Digital Elevation Models from the Map menu. A dialog box (below) will appear; in the upper left hand corner click on:
World 5-minute DEM (ETOPO5), if the area is outside the US, or,
USA 30-second DEM (TOPO30), if the area is in the conterminous US and you have added the topo30 elevation file.
In the lower left hand corner of the dialog box, be sure that the boxes to the right of ETOPO5 and TOPO30 look like the following:
Or, if you have installed SeisVolE in the D drive:
6. Select Redraw from the Map menu (move the cursor quickly away from the map area after selecting Redraw to avoid generating a blank area behind the mouse cursor position as the new map is drawn).
7. Adjust buttons at bottom of screen (magnitude cutoff, selecting earthquakes or volcanoes, etc.) if necessary.
8. Adjust menu items at top of screen (set dates, magnitude/depth scale, etc.) if necessary.
9. Add title, scale and city locations (select Annotations from the Map menu) if desired. City locations are added by selecting Add City from the Map, Annotations menu, and then clicking on the map near the location of a major city. Many city names and locations are stored in a SeisVolE file and the closest city to where you have moved the cursor and clicked will be added. If you add a city that you do not want, just use the Delete City option (from Map, Annotations) and click on the city that you wish to delete.
10. Click Repeat (at bottom of screen) to re-start earthquake sequence.
11. To save the view, select Save View As from the File menu. Choose a name (8 characters or less) that is different from the SeisVolE standard view names. After any changes have been made, use Save View As again (selecting the same name as you chose previously) to save the changes and avoid corrupting the standard view when exiting the program.
12. To save the image (for printing or exporting to another document), select Make Bitmap from the Options menu. You will be prompted for a file name. Save the Bitmap file in the SEISVOLE folder or other location. This file can be imported into an MS Word document or an image- or photo- processing program such as Adobe Photo Deluxe.
Southern California earthquakes, 1960 – 2001; Prof. Lawrence W. Braile, Purdue University, April 2001. This map shows earthquake epicenters recorded by the US Geological Survey and by regional seismograph networks from January 1, 1960 to April 4, 2001. The map was produced using the SeisVolE computer program written by Prof. Alan Jones of the State University of New York, Binghamton (http://www.geol.binghamton.edu/faculty/jones). Epicenters are shown by colored dots. The dot size is proportional to magnitude of the earthquake. Depth of the earthquake is indicated by the color (see Key at upper right). Light blue lines are faults. The base map represents topography of the area using a shaded relief image. The map is made available by IRIS. IRIS is the Incorporated Research Institutions for Seismology, http://www.iris.edu.
Ó Copyright 2001. L. Braile and S. Braile. Permission granted for reproduction for non-commercial purposes.