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首页> 外文期刊>Journal of Volcanology and seismology >On the Influence of Earthquake Energy Rangeon the Estimated Seismicity Parameters before the Magnitude 7.9Kronotskii Earthquake of 1997
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On the Influence of Earthquake Energy Rangeon the Estimated Seismicity Parameters before the Magnitude 7.9Kronotskii Earthquake of 1997

机译：关于地震能量范围的影响，估计地震性参数7.9Kronotskii 1997年地震

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摘要

Results are reported from a detailed study of central Kamchatka seismicity for the period 1962-1997 based on a modification of the traditional approach. The approach involves (a) a detailed structure of the seismic region that recognizes the Kronotskii and Shipunskii geoblocks and two further blocks, the con-tinental slope, and the offshore portion, (b) a study of variations in the rate of M = 3.0-7.2 earthquakes and the amount of seismic energy released at depths of 0-50 and 51-100 km, (c) a study of seismicity variability, and (d) separate estimates of the recurrence of crust—mantle earthquakes (depths 0-50 km) and mantle events (51-100 km). As a result, apart from corroborating the fact of a quiescence preceding the December 5, 1997 Kronotskii earthquake (M 7.9), we also found that a relationship exists between its beginning and the position of the earthquake-generating region relative to the mainshock epicenter. The quiescence dominates the seismic process during the pre-mainshock period and is characterized by a decreased rate of earthquakes (the first feature) and a decreased amount of seismic energy release (the second feature). Based on the first feature, we found that the quiescence started in 1987 throughout the entire depth range (0-100 kin) in both parts of the Kronotskii geoblock close to the rupture zone of the eponymous earthquake. As to the Shipunskii geoblock, which is farther from the rupture zone, the quiescence began in the mantle of the inner area first (1988) and somewhat later at depths of 0-50 km within the continental slope (1989). By the second feature, the quiescence began at shallower depths in the inner area of the Kronotskii geoblock at the same time and later on (a year later) in the mantle (1988). Under the continental slope of the trench in the Shipunskii geoblock the shallower quiescence also began in 1987, while it was 3 years late in the inner zone (1990) and involved the earthquake-generating earth volume at depths of 0-100 km. These data are identical with or suf-ficiently close to the estimate for the beginning of this quiescence using a circular area of radius 150 km that combines the Kronotskii and Shipunskii geoblocks by the RTL method (1990). Based on the data on small earthquakes (M ≥ 2.6) at depths of 0-70 km mostly for the continental slope of the Kronotskii geoblock in the southwestern part of the epicentral area (at distances of 50-100 km from the mainshock epicenter), the quiescence began a little over 3 years (mid-1994) before the mainshock time and a little over 2 years (late 1995) in an immediate vicinity of the mainshock epicenter (0-50 km). These results provide evidence of different times when the stress buildup began in different earth volumes during the pre-cursory period of this catastrophic earthquake; this should be borne in mind when examining the data for the other kinds of geophysical precursors.
机译：结果从1962 - 1997年期间的堪察加地震性的详细研究报告了1962-1997期间的详细研究，基于传统方法的修改。该方法涉及（a）识别Kronotskii和ShipunskiiGeooc块的地震区域的详细结构，以及两个进一步的块，沟通斜率和近海部分，（b）对M = 3.0速率的变化研究-7.2地震和地震能量的震动量为0-50和51-100公里，（c）对地震性变异性的研究，（d）单独的壳体地震复发估计（深度0-50 km）和地幔活动（51-100公里）。因此，除了确定1997年12月5日之前的静态的事实，我们还发现，它的开始与地震产生区域相对于主轴震中的关系之间存在关系。静止在主歇地段期间主导地震过程，其特征在于地震率下降（第一特征）和降低的地震能量释放量（第二特征）。基于第一个特征，我们发现静止在1987年在Kronotskii Geoock的两个部分中的整个深度范围（0-100 Kin）靠近同名地震的破裂区域。至于Shipunskii Geoock，它远离破裂区，静止在内部区域的庭院中开始（1988），稍后在大陆斜坡（1989）内的深度为0-50公里。在第二个特征中，静止在克朗兹库伊地理块的内部区域同时在地幔（1988年）的同时在（一年）的同时在kronotskii Geoock的内部区域。在Shipunskii Geoblock的大陆斜坡下，浅静态也始于1987年，而在内部区域（1990）晚了3年，并涉及地震发生的地球体积，深度为0-100公里。这些数据使用RTL方法（1990）的圆形区域（1990）结合了kronotskii和shipunskii geoocks的圆形半径150km的循环区域，与该静止开始的估计相同或SUF-非常接近该静止的开始。基于对大部分大地震（m≥2.6）的数据，主要用于震中区域的西南部的Kronotskii Geoock的大陆坡度（距离主斯震中的距离50-100公里），静止在主斯卡震中（0-50 km）的立即附近（1995年后，1994年中期）开始了超过3年（1994年年）。这些结果提供了在这种灾难性地震预卷曲期间在不同地球卷中开始的压力累积时不同时期的证据;当检查其他种类​​的地球物理前体的数据时，应该记住这一点。

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