A fast automatic identification method for seismic belts based on Delaunay triangulation
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A fast automatic identification method for seismic belts based on Delaunay triangulation Wei Yan1,2,4 · Xueze Wen1,4 · Changrong He1,4 · Guiping Liu3,4 · Zirui Li1,4 Received: 24 June 2020 / Accepted: 12 November 2020 © The Author(s) 2020 OPEN
Abstract Earthquake prediction practice and a large number of earthquake cases show that there may be abnormal images of small earthquake belts near the epicenter before strong earthquakes occur. For a static small earthquakes spatial distribution, due to the complexity of exhaustive algorithm, the fast automatic identification method of seismic belts has not yet been realized. Visual identification is still the main method of seismic belt discrimination. Based on the Delaunay triangulation, this paper presents a fast automatic identification method of seismic belts. The effectiveness of this method is proved by a 1000 random points test and an actual example of the 4-magnitude belts before the 2005 Jiujiang M5.7 Earthquake. The results show that: (1) Using Delaunay triangulation method, we can fast get the spatial relationship between two neighboring points; (2) using the two neighboring relationships, it can automatically extend to cluster, which carries the key information of seismic belt; (3) using the technology of minimum enclosing rectangle (MER) for the identified cluster, we can get the shape and structural information of the MER, which can be called the “suspect seismic belt”; (4) after using the other restrictions to sort and filter the suspect seismic belt, we complete the identification of seismic belt; (5) the random and actual earthquakes trial calculation shows that the Delaunay triangulation method can realize a fast automatic identification of seismic belts; and (6) this automatic identification method may provide a research basis for earthquake prediction. Keywords Seismic belt · Automatic recognition · Related earthquakes · Suspected seismic belt · Seismic belt clarity
1 Introduction A big earthquake could kill thousands of people (such as 2008 Wenchuan Mw7.9 Earthquake) and trigger a tsunami (such as 2011 East Japan Mw9.0 Earthquake). Whether earthquakes can be predicted is one of the unsolved problems in science all over the world at present. Some scientists believe that earthquakes cannot be predicted [1]. There are other scientists who devote their lives to this scientific problem of earthquake prediction. Since the 1950s, people have discovered some pre-earthquake anomalies that may be related to the occurrence of strong
earthquakes such as seismic belt, seismic gap, seismic recurrence period, and so on [2–14]. Because of the similar distribution of acoustic emission in rock fracture experiment [15], the small earthquake seismic belt may have some unclear physical mechanism. The basic feature of seismic belt is that the seismic spatial distance on the belt is relatively short, and the seismic spatial distance outside the belt is relatively long. In the 1980s, some seismologists began to systematically research the seismic belts. Liu and Chen [2]
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