Increasing number of earthquakes?
The earthquakes having scale of about 7.0 or more were observed to remain occurring constantly all over the world. In the past 20 years, the statistics given by USGS indicated that there is rise in the number of earthquakes identified every year. This is estimated to be due to the increase in number of seismographic stations that are established in many parts of the world. The earthquakes are also probably due to the improvements made in the global communications.
It is reported that there were about 350 stations in the world in the year 1931. By now, the number was updated to eight thousand stations and greater than that while the information from these centers will originate from these stations through mail, satellite and internet. This increase in number of stations and the receiving of data in time very fast from these stations has made the seismological centers to identify the earthquakes and predict them properly. The earthquakes which were not detected in previous years were also located by these stations.
The organization called NEIC is known to locate around 20,000 earthquakes every year and nearly 50 of them every day. The advancements in communication, enhanced interest in the environment and natural destructions had made the people to understand and predict earthquakes. As per the recorded information, which is around 1900, 17 major earthquakes of scale 7 to 7.9 and one earth quake with scale of 8.0 or more than that has occurred in one year.
As per the report, in the year 1992 the average number of earthquakes will go beyond the number that existed in the year 1971. According to the report issued by the “national earthquake information center” of US geological survey, many millions of earthquakes occur every year. Some of them will go off undetected. Hence, if the earthquake scale range is greater than 6.0, then their number was constant all these years. If the earthquakes that were detected were both small and large, then they will increase in their number every year.
Difference Between
Earthquake vs Aftershock Earthquake
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