Web Apps

EQTrace - An Interactive Worldwide Earthquake Atlas


EQTrace displays selected earthquake events from the publicly-available Earthquake Catalog portal of the United States Geological Survey (USGS) website, which contains quake records from January, 1900 to the present. Enter a date range, or specify all quakes within the previous week, day, or hour, select a magnitude and depth range, and optionally limit the search to a selected quadrangular geographic region. The app retrieves the desired set of quakes from the USGS database, and displays them on a 2-dimensional map or a 3-dimensional globe using colored markers that indicate quake location, magnitude and depth. You can view either a static display or run a simulation to show quake events as they occurred in chronological order.

This app is in production; Version 1.1 is available in the Microsoft Store. It is a Progressive Web Application (PWA) and can be downloaded in all browsers that support PWA technology. It runs on mobile devices as well.

EuroWarsAtlas - An Atlas of Conflicts in Europe and the Middle East, 1000 A.D. - 1700 A.D.


EuroWarsAtlas is an interactive map and database of major Conflicts occurring in Europe, the Middle East and western Asia, between the years 1000 A.D. and 1700 A.D. Choose from a number of different Conflicts (for example, Hundred Years War, Italian Wars, Reconquista, etc), or specify a Date Range, or search for events containing a Keyword string in the title or description. The resulting battle events are represented on a 2-D map using markers to define the location. Click a marker to view details on the battle, and to access links to relevant imagery and  Wikipedia articles. The Eurowars database contains over 1400 battle events and 388 digitized colored maps.

This app is in development; there is still much work to do in synthesizing descriptive historical information, and there are a few minor bugs. It is best suited for desktop displays, running the app in full screen mode in your favorite browser.

Time2Time - A Date/Time Difference Calculator


Time2Time calculates the elapsed time between two events (points in time) in various metrics (years, months, days, hours, etc). For both the start date/time and end date/time, enter your desired values, or select the current date/time, or choose from a list of predefined historical events. All dates between 1700 A.D. and 2200 A.D. are supported.

Basic app functionality is implemented for desktop browsers, and it will run on mobile devices but needs some additional work. Full support for all time zones, as well as global clock corrections, leap seconds, and other anomalous conditions, is under development.

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