A look at global seismicity during 1999 in the longer-term time frame

摘要: An analysis and discussion of the main features effects 1999global seismicity based especially on inferred patterns strong(Mw ≥ 7) earthquakes using NEIC/USGS data is presented.Based above their statistical (see also Table 1)one may state that from point view occurrence rate (number/yr)the 1999 global was fairly regular, but moment (orenergy) release standpoint it well under long-term average. The spacepartition again rather typical time distribution quasi-Poissonian,noteworthy, worldwide had an anomalously high deathtoll, to be discussed later. Two new insights are brought by ouranalysis: (i) a (mega)quiescence along whole south American segmentof circum-Pacific earthquake belt, which rated asanomalous while underway which, in retrospect, ended with thegreat (Mw = 8.4 HRV) 2001 Arequipa (Peru) event; (ii) intriguingmonotonous decrease within only magnitude class 5.0 5.9 duringthe analyzed period (i.e., 1990–1999).