Earthquake localization

Terminology:

- Hypocenter or focus: location where earthquake originates

- Epicenter: corresponding surface location (lat., lon.)

- Origin time: Initiation time of the earthquake

(Epicentral distance distance to epicenter)

(max depth seismicity: ~ 700 km)Seismicity Tonga subduction zone 1977-1994

Earthquake terminology

Single station method: S-P travel time difference

Single station method: P wave polarization

Single station method: P wave polarization

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