KeyGraph as Risk Explorer in Earthquake–Sequence
Yukio Ohsawa · Journal of Contingencies and Crisis Management · 2002
KeyGraph, a document–indexing (keyword–extraction) algorithm, is applied for a new purpose: Extracting active faults with risks of near–future large earthquakes from earthquake–sequences. This paper presents KeyGraph as an extractor of causalities from an event–sequence. This validates KeyGraph as a tool for showing why and which active faults are risky, as well as for showing why and which words abstract a document. The risky faults that are empirically obtained by KeyGraph correspond closely to real earthquake occurrences and seismologists’ risk estimation.