Mount Etna is located on the island of Sicily, Italy. It is one of the world’s most active volcanoes and the highest active volcano in Europe outside the Caucasus. Its frequent eruptions often produce spectacular lava flows and ash plumes, ...
Discussion Forum Latest Questions
A seismograph is an instrument used to detect and record seismic waves (P, S and L waves). It consists of a weighted pen or electronic sensor that remains steady due to inertia while the surrounding frame moves with the shaking ...
Earthquakes are most commonly measured on the Richter scale. This is a logarithmic scale used to determine the magnitude of an earthquake, which is the total amount of energy released at the focus. While the Moment Magnitude Scale (Mw) is ...
Tsunamis are caused by the sudden vertical displacement of the seafloor. Thrust or reverse faults, common at subduction zones, push one block of crust upward. This vertical “kick” moves the entire water column above it, creating the massive energy pulse ...
The shape of an isoseismal line is usually irregular. This is because the Earth’s crust is not homogeneous. Seismic waves travel at different speeds and amplitudes through different materials; they might be muffled by mountains or amplified by soft river ...