The city of Poconé, located in the state of Mato Grosso 100km from Cuiabá, recorded a 4.5 magnitude land tremor on the Richter scale on Saturday morning (1st). According to the Brazilian seismographic network (RSBR), the tremor, considered of moderate intensity, was felt by the population.
The seismic shock was recorded by RSBR stations and analyzed by the USP seismology center.
UNB Seismological Observatory Professor Marcelo Peres Rocha explained that the Pantanal region is a region of lithospheric thinning, that is, in which the efforts accumulated by tectonic processes are released more easily.
The last tremor recorded in Mato Grosso took place in Barão de Melgaço, on January 9 this year, and had 1.9 magnitude on the Richter scale.
Understand the Richter scale
The ones more accurately than the “Richter scale”, used a long time ago, says US geological service.
This scale of magnitude of the moment is based on the “seismic moment” of the earthquake, which explains how the earth’s crust moves in an earthquake, the size of the area along the crust fissure and the force needed to overcome friction in that place, along with the seismic waves that change creates.
The magnitude of the moment will be greater if there is more friction and displacement along a greater distance.
Seismic waves are measured by seismographers, which use a pendulum attached to a spring that moves with the earth’s tremor, generating a kind of graph called seismogram.
The magnitude is classified into 10 numbers, with each integer increase equal to 32 times more energy released.
