Tsunami Harddisk Detector
the worlds first freely available P2P warning system

[ usage ]

Main screen of the application (click the image for an enlarged view). The displayed active earthquakes (grey circles) refer to a simulated P2P network, because currently the application is still in beta testing.
The shown network consists of 5 subnets with their respective supernodes and a large number of attached nodes for sensing.

The application is developed in Java, hence it runs on any computing platform that supports at least Java 1.6. Sensing of seismic activity is very hardware related and is currently only supported on Windows.

To the left you see the main window. The large buttons on the left border allow to control the application. When you start it the first time, use the 'Location Settings' button to make your geographical location known to the network. A window will appear (see below), which prompts you for your local latitude, longitude and the orientation of your computer. These data can be obtained from a GPS-mouse or from www.gpsvisualizer.com. If you do not enter your coordinates, the software will try to use your IP address to estimate your location.

By pressing 'Connect' you will be attached to the P2P network. If you become a node or a supernode depends on the current network topology and your preferences (see below). By pressing 'Disconnect' you will leave the P2P network again.

The main window displays the earth in Mercator projection. Previous earthquakes are shown as colored dots. The colour indicates the depth of the earthqake focus:
red: 0-33 km
orange: 33-70 km
green: 70-300 km
blue: 300-700 km


Display of a currently active earthquake near California, magnitude 0.12.

Currently active earthquakes, which are sensed by the P2P network, are indicated by animated grey circles (see left). The intensity of the earthquake is displayed by a numeric value in the epicenter. Strong undersea-earthquakes can initiate a Tsunami. If the application detects such an earthquake, it will display a window with a warning message.

Network display:: The P2P network you are connected to is displayed by blue wires as an overlay on the earth map. The little blue dots indicate network nodes (which perform sensing), while the larger red dots indicate supernodes (which perform data analysis). Your own location is indicated by an even larger red dot. The current status of the network display as well as the currently active earthquakes is updated by pressing 'Refresh Network Display'.

The white area at the bottom of the window displays status messages, for example the name of the supernode you are attached to, as well as possible network error messages.

Set your geographical location and orientation of the computer in this window (click image for an enlarged view).

Location settings:: In the window to set your geographical location, you also need to set the orientation of your computer. This is necessary, because when your harddisk is used for sensing, the sensors signal will depend on how your harddisk is oriented with respect to the seismic wavefront of the quake. By definition, an orientation of 0 deg refers to a harddisk whose cables point in the northern direction. The orientation is measured counter-clockwise.

Preferences window.

Preferences:: In the preferences window you can set the parameters for acceleration sensing and for the P2P network.

Several strategies are used to estimate the acceleration due to earthquakes. Two of them may impact your system performance. These can be switched off selectively: (i) analysis of the Position Error Signal and (ii) the read/write access time. The first method is not possible on all harddisks, because the manufacturers usually keep the method to read this signal as a trade secret. Also the quality of vibration sensing depends on your components.

In the second section of the preferences window, the parameters for the P2P network are set. You can force the application not be become a supernode, hide yourself from other users, get information only about undersea earthquakes and be notified of new software releases.


The contents of these pages and provided software are used at your own risk. We do our best to make the warning system as reliable as possible. The authors of the site, its algorithms and data ACCEPT NO LIABILITY UNDER ANY CIRCUMSTANCES FOR ANY USE OF ANY INFORMATION OBTAINED FROM THIS SITE.

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