Sources of Signal Interference Earth’s Atmosphere Solid Structures Metal Electro-magnetic Fields
Differential GPS True coordinates = x +0, y +0 Correction = x -5, y +3 DGPS correction = x +(30-5) and y +(60+3) True coordinates = x +25, y +63 DGPS Site x +30, y +60 x +5, y -3 x -5, y +3 DGPS Receiver Receiver
TSUNAMETER – Surface Buoy The SB is composed by a metallic pole and a foam body having a diameter of 1.45 m. The main parts installed on the buoy are: 1. The electronic box containing the SB Data Acquisition and Communication System (SB-DACS) relied on the same type of electronics of the UM;
2. An autonomous power supply system composed of 3 photovoltaic panels (12V- 50W each) and a gel battery pack (12V- 400Ah); 3. A magneto-inductive surface modem or the acoustic modem for the data link with the underwater unit; 4. A satellite modem Inmarsat C for reliable data connection with the Onshore Centre (OC).
Tsunameter -- S ystem Functionalities It is provides the main basic functionalities listed below: 1. C ontinuous measurement of the sea bottom pressure with a rate of 15s, 30s, 1min, 2min, 5min selectable be the user in the OC. Optional monitoring of earthquakes occurrence. 2. O n line processing of the pressure data filter to detect a frequency component typical of a tsunami: the thresholds for the detection of tsunami waves can be configured by the OC user.
The beginning of a possible event is automatically triggered by the pressure sensors (able to detect earthquake waves) and also by the hydrophone/seismometer if installed in UM.
The UM can start the tsunami detection algorithm also on user request from the OC in case of identification of seismic activity in the interested area.
Daily synchronisation of the SB and UM clock with the GPS.
Self-diagnostic and periodical notification to the OC.
Tsunameter -- S ystem Functionalities 7. Internal logging in UM and SB of all acquired data, all detected events, all diagnostic status and exchanged messages (black box). 8. Remote configuration of the UM (change of communication settings, filtering parameters, on/off of sensors and devices, software updating). 9. R eception of commands from OC and notification of its execution; 10. Reception of data request from OC and reply with the requested data .
6. After the decrease of the tsunami wave components under some minimal threshold (parameter remotely configurable by the OC user) and after a period of some hours (parameter remotely configurable by the OC user), the UM chages from ALARM MODE to IDLE MODE.
Information Dissemination The Tsunami Alarm System receives earthquake and tsunami warning information from a multiplicity of seismic measuring stations and tsunami warning stations from different countries . Alarm being sent to your mobile telephone
Conclusion: Key Components to an ideal Tsunami Warning and Response System: 1. Risk Assessment 2. Detection 3. Warning 4. Response Plan 5. Ready Public 6. Situational Awareness 7. Lessons Learned
With the Tsunamis Detection, no fear visiting the coast all over the world ! Next