A Richter scale also known as local magnitude (ML) scale:
Heres a copy of one
http://www.sdgs.usd.edu/publications/maps/earthquakes/images/RichterScale.gif
Contour map
A seismometer (replacing the outdated term seismograph), but other instruments may also respond to an earthquake. The simplest example of a seismograph is a pendulum.
Richter was born on an Ohio farm in 1900. He died in 1985.
The region of zero electron density is called a "node."
Seismograph
A seismometer.
Seismology.
Richter scale
A multivariate graph.
Tsunami
Ring of fire
Contour map
Earthquake swarm
The Ring of Fire.
vertex
Earthquakes aren't given names, but they are given magnitudes, if that's helpful. The magnitude for the earthquake that caused the Hati disaster was 7.0.
hexonagle develoment