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Thermal precursor: A few months before the occurrence of an earthquake the average temperature of the area keeps increasing. Weather report bulletins refer to temperatures above or below average by so many degrees. It is seen that in case the area is heading for an earthquake, the average temperature goes on increasing. On the day of the earthquake it is about 5 to 9 degrees Celsius above the average normal temperature for that day. This could be monitored by the meteorology department and also by thermometers inside homes.
Water precursor: There is a sudden rise or fall in water level in the wells. It could be as high as one metre. Sometimes the well water may turn muddy. At times a fountain appears inside the well. All these changes happen about one or three days before the earthquake. Sometimes a fountain appears in the ground. This normally happens a few hours before the quake.
Another form of water precursor is seen in the flow of riverwater. There is a sudden and rapid increase or decrease of water flow in the river or nallah. This happens about one to two days before the quake. In wells, the well water may begim to bubble.
Seismo-electromagnetic precursor: This is a very reliable precursor. It occurs and is exhibited about 10 to 20 hours before the quake. Before the occurrence of an earthquake the subsurface temperature rises. As a result of this the geomagnetic field is reduced. The reduction in geomagnetic field adversely affects the propagation of electromagnetic waves. This is experienced abundantly on the radio, television and telephone.
If one is tuning the radio at 1000 kHz, then the same station will be received in the potential epicentral area, about 10 to 30 hours before the quake, at higher frequencies. Maybe 1100, 1200, 1300, 1800, 1900, 2000 kHz or so.
Similarly, reception on television is affected by audio, visual and spectral disturbances. The telephone's reception is also adversely affected and there is a continuous disturbance that you can hear.
Apart from this, a recent reliable precursor is the mobile telephone. It has been found that about 100 to 150 minutes before the occurrence of an earthquake, mobile telephones start non-functioning or malfunctioning. The timespan indicated is sufficient to take all necessary mitigatory measures.
A word of caution: all the above precursors are valid only when seen and manifested extensively. Failure of one or two instruments should not be taken as a seismic precursor.
Animal precursor: It is seen that 10 to 20 hours before the occurrence of an earthquake, the entire animal kingdom becomes highly disturbed and restless. They move in a directionless manner and in fear. Birds do not sit on trees but move about at a low height, emitting a shrill noise. Rodents like rats, mongooses etc are in a panic. Domestic animals like cows, dogs, cats etc struggle against being tied up, and even turn on the owner. Pandas may moan.
Human precursor: Doctors and nurses observe that some sensitive patients in hospitals become highly disturbed. They exhibit a sudden rise in blood pressure, heart trouble, headache, migraine, respiratory disorders etc. Further, these psychosomatic signs are manifested without any provocation. It is also seen that the number of patients in the out-patient department increases by five to seven times, some 10 to 20 hours before the quake.
The best indicator is the number of child deliveries in any hospital. On the penultimate day of the earthquake the number of deliveries goes up about three to five times, while on the day of the earthquake it is as high as seven to eight times the normal.
What else can I help you with?
What are some the warning signs of a tsunami?
Some warning signs of a tsunami include a noticeable withdrawal of water from the shoreline, a loud roaring sound coming from the ocean, and the ground shaking. Other signs may include rapidly rising or falling tides and the presence of frothy, muddy water moving inland.
Warnings signs before Kashmir earthquake?
before the earthqauke there was news that dogs was howling in Pakistan and they would all gather together and howl and than shortly after all the animals went missing from Pakistan especiallt the dogs in the streets, quote from scintific global. and also the ground started to crack aswell.
Do Earthquake have warning sign?
None that are currently known to scientists. There is some research studying the small earthquakes that often precede larger ones, but most small earthquakes occur independently of large ones.
Do scientists know when an earthquake can happen?
Scientists can predict where earthquakes are more likely to occur based on historical data and tectonic plate movements, but the exact timing of an earthquake is difficult to predict accurately. Monitoring of seismic activity can provide some warning signs, but forecasting the precise time of an earthquake remains a challenging task.
What comes before during and after and earthquake?
Before an earthquake nothing perceptible to humans happen. Several types of animals act up though. During a earthquake the ground trembles. Depending on the magnitude this might be anything from a light tremble to a violent shaking. Most of the time nothing happens after an earthquake, but sometimes there is an aftershock, which is another earthquake of a lesser magnitude.
What are the warning signs of a tsunami?
If you feel an earthquake,or if you see the ocean receding unusally rapidly.
What warning signs are there before a drought happens?
there are no warning signs
What do green warning signs mean?
Green signs are not warning signs. They are signs that tell you it is "safe" to do something.
What are the natural warning signs that tsunamis are coming?
Natural warning signs of an approaching tsunami include a sudden rise or fall in sea level, a loud roaring sound coming from the ocean, and water receding unusually far from the shoreline. Additionally, an earthquake or strong shaking felt near the coast can be a precursor to a tsunami.
What is the most common color of warning signs?
The most common color of warning signs is yellow.
What are some the warning signs of a tsunami?
Some warning signs of a tsunami include a noticeable withdrawal of water from the shoreline, a loud roaring sound coming from the ocean, and the ground shaking. Other signs may include rapidly rising or falling tides and the presence of frothy, muddy water moving inland.
How can I find about more about warning signs?
It depends on what warning signs that you are interested in. Many sites offer guides on how to spot the warning signs for illnesses etc. If it is to do with motoring check the highway site for details.
How much warning was there on the Japan tsunami and earthquake in March 2011?
There was little to no warning about the coming of the earthquake and tsunami that hit Japan on March 2011.
What is a tsunami warning device?
Animals earthquake
Early warning signs of storms and precautions to be taken to ensure safety?
Early warning signs of storms and precautions
Warnings signs before Kashmir earthquake?
before the earthqauke there was news that dogs was howling in Pakistan and they would all gather together and howl and than shortly after all the animals went missing from Pakistan especiallt the dogs in the streets, quote from scintific global. and also the ground started to crack aswell.
Is there a way to detect and earthquake?
Yes, earthquake is the breakdown of geological structure. There is the pre-warning wave emitted out before the start of the earthquake. However, the detection can only give a warning at a short period of time.
