EARTHQUAKE ›› 1998, Vol. 18 ›› Issue (1): 7-13.
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Chen Lide
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Abstract: During the short-term and impending predictions of Lijiang earthquake ,recognition of the characteristics of successional anomalies , new successional anomalies and new anomalies is discussed. Meanwhile, the criteria of anomalies entering the short-term and impending phase,such as the ending of the medium-term anomalies,dramatic anomalies and syn chronous turning, of Lijiang earthquake is also discussed. Finally, based on discussion of time-space evolution of the short-term and impending anomalies, the author has presented a new focal seismogenic model-the focal hardening model.combining the facts mentioned in other papers ,such as anomalous quiescence of small earthquakes within epicentral area, the station-based precursory anomalies migrating from the periphery towards the epicenter, anomalies in the periphery having large amplitudes and quantity and so on. According to the model, the anomalous quiescence of small earthquakes should appear during the medium-and short-term phase within the epicentral area (aftershock-distributed or macrofissure-distributed areas), and no or a few station-based precursory anomalies appear. However, when a strong earthquake is developed towards nucleation of fractures, that is the unreversible unstable phase, distinct macro-fissures probably appear in some focal areas,namely sand-eruption and foreshock activity may appear.
Key words: Short-term and impending anomaly, Time-space evolution of anomaly, Focal hardening model, Lijiang earthquake
Chen Lide. CHARACTERISTICS OF SHORT-TERM AND IMPENDING ANOMALIES FOR LIJIANG EARTHQUAKE WITH M=7. 0 AND FOCAL HARDENING MODEL[J]. EARTHQUAKE, 1998, 18(1): 7-13.
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https://dizhen.ief.ac.cn/EN/Y1998/V18/I1/7