A report gives one Mw value from seismograph records for the quake, but a city map uses Roman numerals that change from town to town. What do the Roman numerals report?

Two stations record the same earthquake. A site on soft sediment reports MMI VIII, while a bedrock site reports MMI VI. What is true of the earthquake's magnitude at the two sites?

A seismologist assigns one number to the size of an earthquake at its source using seismic records. What kind of value is this?

Residents' reports of rattled dishes, cracked plaster, and toppled chimneys are collected after a quake. Which scale is built from those observations?

An offshore quake has magnitude 7.8. Coastal clay has severe damage while inland bedrock has light damage. What explains the different numbers on the damage map?

A news story says, “The earthquake was felt as IV in one town and VII near the epicenter.” Why is the value higher near the epicenter?

Use the table and the rule that each whole magnitude step releases about 32 times more energy. About how much more energy did quake B release than quake A?

Use the table and the 32-times-per-step energy rule. About how much more energy did quake D release than quake C?

Use the table and the 32-times-per-step energy rule. Compared with quake E, about how much energy did quake F release?

Use the table and the 32-times-per-step energy rule. How does quake H's energy compare with quake G's energy?

Use the table and the 32-times-per-step energy rule. About how much more energy did quake J release than quake I?

The table shows maximum ground-motion amplitude recorded at the same distance. How does quake B's magnitude compare with quake A's?

At equal distance, the table compares two recorded amplitudes. How does quake C's magnitude compare with quake D's?

Use the equal-distance amplitude table. How does quake E's magnitude compare with quake F's?

At equal distance, the table gives peak amplitudes from one seismograph. What is quake H's magnitude compared with quake G's?

Use the table. At the same distance, about how should quake K's wave amplitude compare with quake J's?

Use the damage scene. Which earthquake hazard best explains this aftermath?

Use the damage scene from a coastal town. Which earthquake hazard is shown?

Use the damage scene on the mountain road. Which earthquake hazard is shown?

Use the damage scene showing a cracked road. Which earthquake hazard is shown?

Use the damage scene in a city block. Which secondary earthquake hazard is shown?

The December 26, 2004 Sumatra-Andaman earthquake was magnitude 9.1 off Indonesia. What carried deadly damage to distant coasts around the Indian Ocean?

In the April 18, 1906 San Francisco earthquake, shaking broke gas and water lines across the city. Which secondary hazard caused most of the damage over the next three days?

The March 27, 1964 Great Alaska earthquake struck Prince William Sound. What record does this event hold?

During the 1989 Loma Prieta earthquake, San Francisco's Marina District had severe damage on bay fill and lagoon deposits. What site effect was central there?