CONCEPT

SUBCONCEPTS

ACTIVITIES

SECTION ONE:

"What is an Earthquake? The basic facts of seismology"

Forces in the Earth cause its surface to change over time

Earthquakes are movements in the Earth's crust.

Ground motions result from shifts in the Earth's crust along breaks called faults.

Shifting along a fault can be modeled by movements along a plane.

The properties of faults can be described using a variety of observations.

The properties of faults in an area depend on the forces in that area

Rescue in Pinevale

Fault-Rupture Analogies

Rupture Models

Strike and Dip

Revealing a Fault Plane with Hypocenters

Scarp Formation

Dip Slip and Crustal Dimensions

Oblique Slip

Recurrence Interval

Different Data, Different Rates?

How Tectonic Forces Affect Faults

Find That Fault Slip!

Regional Distibution of Fault Slip

Partitioning Slip

SECTION TWO:

"The Distribution of Earthquakes: Rates and relations in seismology"

Earthquakes occur in clusters.

Earthquakes are clustered in zones where the Earth's crust has been deformed.

The locations of earthquakes are generally associated associated with major faults.

The locations of earthquakes are often associated with topographic features

The locations of earthquakes vary in depth.

Earthquakes are clustered randomly in time.

The rate of earthquakes varies over time.

Past rates and patterns of seismicity can be used to calculate future probabilities of earthquakes.

Seismicity rates may be related to properties of the Earth's crust.

Where Do Earthquakes Happen?

Where Do Large Earthquakes Occur?

Does Topography Signal Earthquake Potential?

An "In-Depth" Look at Earthquake Distribution

Seismicity Rates

Is Earthquake Timing Influenced?

Landers Shakes Things Up

b ­Values

Estimating Aftershock Progression

Recognizing Foreshocks

An Earthquake Deficit?

Slip Rates vs. Seismicity Rates

Earthquake Swarms