Open Modular Interactive Mapping Technology
for Visualization of Geophysical Data on the Internet

4. Applications

Points with attributes for seismicity map

In Fig. 16 the specified task is to display the recent rapid earthquake determination reports in the table and on the map with selectable geophysical layers related to seismology. The reports are sent by e-mail to the application server from the earthquake determination service, parsed and loaded into relational database. In the table all the data from the report are listed. On the map we show the earthquake locations and magnitudes. When earthquake epicenter is selected on the map, the corresponding report table raw is highlighted. When the earthquake report is selected in the table, the corresponding epicenter is highlighted on the map. It is possible to zoom the map to the selected epicenter and to show/hide GIS layers such as faults, elevation, population density, tectonic stress, and historical seismicity.

The dynamic earthquake epicenter plotting is implemented in the MapApplet add-in module obnrep. The earthquake reports are selected from database for the given time interval, serialized into DTO to be plotted on the map, and inserted as a JavaScript array into the reply HTML page which is listed in the table. Then when the page with the new table and URL to the DTO is received, the web browser renders the table in the bottom frame and sends an event to the MapApplet in the upper frame to download and plot DTO from the given URL. After the map is plotted, selection of the same event in the list and on the map is done using the JavaScirpt � Java interaction mechanism.

message # date-time magnitude region lat (deg) lon (deg) depth (km) message text 393 OBN  2004-03-02 10:52:41  6.0(MS) 4.3(mb)  Tadzhikistan  37.6  73.07  120 Obninsk, Early Alert Service393.Preliminary hypocenter for earthquake of 2004MAR02 O=10h52m41.6s(utc) 37.60n 73.07e H=120.mb=4.3 region Tadzhikistan 392 OBN  2004-03-02 10:19:54  5.1(MS) 4.2(mb)  Panay  11.47  122.82  340 Obninsk, Early Alert Service392.Preliminary hypocenter for earthquake of 2004MAR02 O=10h19m54.6s(utc) 11.47n 122.82e H=340.mb=4.2 region Panay 391 OBN  2004-03-02 09:31:44  7.4(MS) 5.0(mb)  Near coast of Nicaragua  11.94  -86.61  100 Obninsk, Early Alert Service391.Preliminary hypocenter for earthquake of 2004MAR02 O=09h31m44.0s(utc) 11.94n 86.61w H=100.mb=5.0 region Near coast of Nicaragua 390 OBN  2004-03-02 07:51:53  4.3(MS) 4.5(MS)  Southern Iran  29.71  51.57  50 Obninsk, Early Alert Service390.Preliminary hypocenter for earthquake of 2004MAR02 O=07h51m53.7s(utc) 29.71n 51.57e H=50.MS=4.5 I0=3.5-4 region Southern Iran 389 OBN  2004-03-02 03:47:27  4.0(MS) 6.0(MS)  Near coast of Nicaragua  11.98  -86.86  70 Obninsk, Early Alert Service389.Preliminary hypocenter for earthquake of 2004MAR02 O=03h47m27.4s(utc) 11.98n 86.86w H=70.MS=6.0 I0=5.5 region Near coast of Nicaragua message # date-time magnitude region lat (deg) lon (deg) depth (km) message text Magnitudes: M <= 3 3 < M <= 5 5 < M <= 7 7 < M <= 9 M > 9