Epicenter Distance Calculator

Formula

The formula to calculate the Epicenter Distance (ED) is:

\[ ED = (S - P) \cdot 8.4 \]

Where:

\(ED\) is the Epicenter Distance (km)
\(S\) is the arrival time of first shear wave (s)
\(P\) is the arrival time of first compressional wave (s)

Epicenter Distance Definition

The epicenter distance is the distance from a seismic station to the epicenter of an earthquake. It is calculated based on the difference in arrival times of the first shear wave (S-wave) and the first compressional wave (P-wave). This distance helps in locating the epicenter of the earthquake and understanding its impact.

Example Calculation

Let's assume the following values:

Arrival Time of First Shear Wave (S) = 30 seconds
Arrival Time of First Compressional Wave (P) = 20 seconds

Using the formula to calculate the Epicenter Distance (ED):

\[ ED = (30 - 20) \cdot 8.4 = 84 \]

The Epicenter Distance (ED) is 84 km.