地震序列类型、地震序列b值与地震大形势关系初探  

STUDY ON TYPES OF EARTHQUAKE SEQUENCES AND RELATION BETWEEN b-VALUE 0F EARTHQUAKE SEQUENCES AND LONG-TERM TENDENCY OF STRONG EARTHQUAKES

作　　者：焦远碧[1] 

机构地区：[1]国家地震局分析预报中心,中国北京100036

出　　处：《地震》1998年第1期33-40,共8页Earthquake

摘　　要：根据最大地震与次大地震震级差将地震序列划分为孤立型、主余型、双震型和多凑型4种。通过对我国大陆143个序列划分结果，孤立型占14％，主余型占59％，双震型占13％，多凑型占14％。地震序列b值与主震震级和序列类型有关，在类型相同的情况下主震震级越大序列b值越高，在主震震级相近的序列中孤立型序列b值最小，主余型和双展型居中且差别不大，多展型b值在7级和6级地震序列中都是最大的。根据实验结果探讨了序列b值变化的原因，讨论了利用7级地震序列b值变化预测地震大形势的可能性。According to difference of magnitude between the largest and second largest earth-quakes,the earthquake sequences are divided into four types, i- e. the single major shock,major-after shock,double major shock and multiple major shock. The results of divisionfrom l43 earthquake sequences in China's continent show that: the single major shocktakes l4%,the major-after shock takes 59%,the double major shock takes 13%,and themultiple ma jor shock takes 14%. The b -value of earthquake sequences are related to ma jorshock magnitude and type of sequences. It is increased with the raising magnitude of majorshock as the same type. Under similar major shock magnitudes, b -value of single ma jorshock is the smallest, b -value for types of ma jor-after shock and double major shock aremedial with small difference, b -value of multiple ma jor shock type is the largest,no matterwhat if the major shock magnitude is 7 or 6. The possibility to predict the long-term ten-dency of strong earthquakes by using the b -value change in the earthquake sequences withM =7 is also discussed.

关 键 词：地震序列 序列类型 B值 地震大形势 地震预报 

分 类 号：P315.7[天文地球—地震学] P315.2[天文地球—固体地球物理学]