Earthquake Measurement Quiz

What does the term 'magnitude' refer to in the context of earthquakes?

• The amount of energy released from the focus of an earthquake.

• The depth of the earthquake's origin.

• The geographical area affected by the earthquake.

• The duration of the earthquake.

What is 'intensity' a measure of?

• The earthquake's strength based on its impact on a specific location.

• The total energy released during the earthquake.

• The depth of the earthquake.

• The speed of seismic waves.

Who developed the Richter Magnitude Scale?

• Giuseppe Mercalli

• Charles F. Richter

• Francois-Alphonse Forel

• Michele de Rossi

What does the Rossi-Forel Intensity Scale use to denote earthquake intensity?

• Arabic numerals

• Roman numerals

• Letters

• Colors

Which scale was used formerly by PHIVOLCS before developing its own intensity scale?

• Rossi-Forel Intensity Scale

• Richter Magnitude Scale

• Moment Magnitude Scale

• Mercalli Intensity Scale

What is the main focus of the Mercalli Intensity Scale?

• Geological surveys.

• Sensory observations to determine intensity.

• Seismogram analysis.

• Mathematical calculations.

What does PHIVOLCS stand for?

• Philippine Institute of Earth Sciences

• Philippine Institute of Seismic Research

• Philippine Institute of Volcano Studies

• Philippine Institute of Volcanology and Seismology

Which earthquake had a magnitude of 8.1 on the Richter scale?

• Bohol, Tagbilaran City

• Laog City, Ilocos Norte

• Casiguran, Aurora

• Moro Gulf, North Celebes Sea

What intensity level did the earthquake in Laog City, Ilocos Norte reach according to the Rossi-Forel Intensity Scale?

• VI

• IX

• VIII

• VII

Which of the following earthquakes occurred on August 17, 1976?

• Casiguran, Aurora

• Moro Gulf, North Celebes Sea

• Bohol, Tagbilaran City

• Laog City, Ilocos Norte