CAJ | 학술논문

地下核爆炸区域及远区地震波信号中，有二次源即层裂源的贡献，其对区域震相 Lg波具有调制作用。本文利用理论地震图数值模拟方法，分析爆炸源和层裂源在3种典型介质速度模型下的区域震相特征，得到了爆炸源和层裂源所激发的 Lg 波与介质速度模型的关系，并结合 CLVD 源所激发的 S 波随震中距的演化过程，对 Lg 波的形成机制进行了阐述。结果表明，CLVD 源是激发地下核爆炸低频 Lg 波的主要因素。
지하핵폭작구역급원구지진파신호중，유이차원즉층렬원적공헌，기대구역진상 Lg파구유조제작용。본문이용이론지진도수치모의방법，분석폭작원화층렬원재3충전형개질속도모형하적구역진상특정，득도료폭작원화층렬원소격발적 Lg 파여개질속도모형적관계，병결합 CLVD 원소격발적 S 파수진중거적연화과정，대 Lg 파적형성궤제진행료천술。결과표명，CLVD 원시격발지하핵폭작저빈 Lg 파적주요인소。
Spall is defined as a secondary seismic source contributing to regional and far field seismic signals generated by underground nuclear explosions.It can modulate the regional phase,i.e .,Lg waves.This paper analyzed the character-istics of Lg waves excited by explosion source and spall based on three typical crustal models by using numerical simulation of theoretical seismograms,then obtained the relationship between the crustal velocity models and the Lg waves excited by explosion source and spall.To explain the generation mechanism of Lg waves,we investigated the variation of S waves induced directly by compen-sate linear vector dipole (CLVD)source with different epicentral distances.The results indicate that CLVD source plays an important role in generating low-frequency Lg waves by underground nuclear explosions.