Glossary

AEIC

ASEAN Earthquake Information Center

BMKG

Indonesian Meteorological, Climatological and Geophysical Agency - Badan Meteorologi, Klimatologi, dan Geofisika

CSV

Comma-separated values file

Displacement

A GNSS displacement is a TOAST object representing the difference in position of a point before and after an event.

ETA

Estimated Tsunami Arrival

ETM

Estimated Time of Maximum Sea Level

EMSSH

Estimated Sea Surface Height

FFT

Fast Fourier Transform. See: Wikipedia - FFT.

GFZ

German Research Centre for Geosciences

GIF

Graphics Interchange Format

GITEWS

German Indonesian Tsunami Early Warning System

Green’s Law

When propagating into shallower water, tsunami waves slow down and increase in amplitude. See: Wikipedia - Green’s law.

GUITAR

GUI for Tsunami Alert Review (Predecessor of TOAST)

HTML

Hypertext Markup Language

IIR

Infinite Impulse Response. See: Wikipedia - IIR.

Incident

The term event is used in SeisComP and the term incident in TOAST context. An event object contains data related to a seismic event, like origins, magnitudes, focal mechanisms, type and also preferred origin, preferred magnitude and preferred focal mechanism. An incident is the main object when using TOAST. It contains tsunami relevant data like source parameters (magnitude, location, depth, time, nodal planes), observed tsunami data (picks, amplitudes) and simulation references. It can also contain a reference to a SeisComP event object, which is the case for automatically generated incidents. If an artificial incident is created manually, it does not contain an event reference.

Kagan angle

Represents the difference between the orientation of two focal mechanisms (moment tensors). See: Y. Y. Kagan, 3-D rotation of double-couple earthquake sources, Geophysical Journal International, Volume 106, Issue 3, September 1991. In TOAST usually the term rotation Angle is used, both for the minimum rotation angle between focal mechanisms as well between nodal planes, in which case an adapted version of the Kagan angle is computed.

NTWC

National Tsunami Warning Center (USA)

OTA

Observed time of tsunami arrival

OTM

Observed time of tsunami maximum wave height

OMSSH

Observed tsunami maximum wave height

OTP

Observed tsunami period

POI

Point Of Interest (Tide gauge, buoy or GNSS station)

PTWC

Pacific Tsunami Warning Center

RTSP

Regional Tsunami Service Provider

SSH

Sea Surface Height deviation from mean sea level

T1

Time of exceedance of the detection threshold (only positive amplitude by default, configurable on plugin level via T1Threshold and T1Absolute).

T2

Time of first exceedance of the threat threshold

T3

Time of maximum positive amplitude

T4

Time of last exceedance of the threat threshold

Tx Value

SSH value at above times

TOAST

Tsunami Observation and Simulation Terminal

XML

Extensible Markup Language