Worldwide earthquake researches have revealed some indicators were identified before the earthquake. When the researches are examined, it was understood that the advancement of the earthquake early warning and forecasting work by one parameter was insufficient. As a result of the researches, it has been determined that continuous and simultaneous collection of different parameter data related to earthquake is effective and necessary for "earthquake management" in order to examine and control earthquake. At this point, "combined sensor system (BSS)", the basis of our project, has become necessary.
We have already mentioned that multi-parameter measurements in earthquake prediction studies will be a very advantageous approach to earthquake problem. Within the scope of this project, we will combine the main parameters related to the earthquake and the side parameters affecting them together in a data repository by means of the special stations called composite sensor system.System Content
Earthquake management is the period in which the negative effects that may occur on people and structures from the source of the earthquake to the end of the activity are controlled. This process has been studied in three stages, before, during and after the earthquake.
Before Earthquake : Detection and evaluation of pre-earthquake indicators with main sensors which supported with auxiliary sensors.
During an Earthquake : Detection of the first P-wave in the earthquake occurrence and warning of the main system.
After Earthquake: Triggering the autopilot drone systems of the main system with P-wave warnings and obtaining the visual data of the earthquake zone.
Prediction is the process of reasoning about the likelihood of an event taking place in the future based on certain indicators. When this definition is viewed from an earthquake point of view; the prediction is determining of the location, time and size of the earthquake according to the premise signs of earthquake. Precision-free predictions can create both sociological and economic disadvantages.
Strong seismic shaking from an earthquake travels at about 2 miles per second, so it is possible to detect a large earthquake near its source and broadcast a warning of imminent strong shaking to more distant areas before the shaking arrives.
An earthquake early warning system on the west coast of the United States could provide as much as 60 seconds advance warning prior to strong shaking arriving depending on the location of the location of the earthquake and the recipient of the warning. The time required to detect and issue a warning for an earthquake is dependent on several factors
Following the Great Kobe Earthquake in Japan in 1995, public investigations conducted in the region investigated the anomalies that stood out before the earthquake. The most common anomaly is that long-haul truckers complaints about interference in radio frequencies. In 1989, Yukio Fujinawa and Kozo Takahashi wrote "The electromagnetic radiation absorption before Ito seismic activity" and In 1998, Shingo Yoshida's work, "Electric Potential Changes Before Cutting Breaks in Dry and Saturated Rocks", showed that the rocks underwent electrical fluctuations.
Generally, some changes in groundwater levels, temperatures, chemical structures have recently occurred before earthquakes. This method is one of the methods used for predicting earthquakes in the past. Change of groundwater level; Bending of the earth's crust, deformation and increased permeability are the result and can be observed in wide area.
In earthquake prediction studies, several methods are evaluated together. One of these methods is to evaluate the relationship between the radon gas concentration change in the soil and the earthquake. Measurements of radon gas soil are considered as one of the important parameters in earthquake prediction studies.
Radon gas is a colorless, odorless and chemically inert gas. Radon gas is the result of radioactive fragmentation and isotopes are found in soil, water and various geological formations.
In addition to basic parameters such as electromagnetic noise, radon gas emission, groundwater level measurements, which are effective in earthquake preliminary estimations, variable auxiliary parameters such as temperature, pressure, humidity, magnetic field changes belonging to the region are also needed.
Temperature and Humidity: When an earthquake occurs, when the energy in the fault lines is released, the hot air output is mixed with the air on the earth, resulting in higher temperatures than the seasonal norms and falling below the seasonal norms after the earthquake.
Air Pressure: In the studies conducted, it is observed that there is a relationship between seismic activity and pressure changes observed for hours or even days. A few days of air pressure changes are often associated with high probability seismic activity.
Magnetic Field: Earthquake occurrence has nothing to do with the magnetic field, it is caused by the physical movements of the plates. However, depending on the stresses that occur in the rocks, the magnetic field and many other parameters may change.