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EARTHQUAKE: Part 2 - Coggle Diagram
EARTHQUAKE: Part 2
Distribution of Earthquakes
CIRCUM-PACIFIC BELT (Convergent Plate Boundaries):
The most widespread and severe earthquake activity occurs along subduction zones
A subduction zone is the biggest crash scene on Earth. These boundaries mark the collision between two of the planet's tectonic plates
In the West from Alaska to Kurile, Japan, Mariana and the Philippine, there are two divisions, one going towards the Indonesian trench and the towards the Kermadec-Tonga trench to the north-west of New Zealand
In the East, it follows the west coast of North America, continues southward along Peru and Chile trench on the west coast of South America.
Their focus more then 25 km deep, 66% of the earthquakes of world are recorded in this belt
MID-ATLANTIC BELT (Divergent Plate Boundaries)
Cause: Seafloor spreading
Extends along the mid-oceanic ridges and islands near the ridges of Atlantic Ocean
Has moderate intensity and less than 70 km deep
The extension of this belt is the The Rift of East Africa and Red sea
Instruments
MEASURMENT OF EARTHQUAKES:
For magnitude Richter Scale is used to measure, devised by eminent seismologist Charles Richter in 1935 and then modified by Richter and his colleague Beno Gutenburg
It also can be related to the energy emitted at the earthquake centre
It does not have a maximum or minimum, but the highest is rated as 8.4
Distribution of Earthquakes
MID-CONTINENTAL BELT:
Extends along the Alpine mountain system of Europe, Rockies, through Asia Minor, Caucasia, Iran, Afghanistan and Pakistan to Himalayas, Tibet, Pamir, Tien-Shan, Altai and mountains of China, eastern Serbia and Myanmar
21% of the earthquakes is recorded in this belt and deep focus is absent