“影区地震”释义作者最近应邀为内蒙地震局测震培训班授课,其中涉及“影区地震”这一术语的定义和物理含义的问题,不少学员感到困难。什么是“影区地震”?有人望文生义,定义为“发生在影区内的地震”。我问这个学员:“影区在那里?”回答说:“在地下低速层内。” Recently, the authors of the interpretation of “Cinema-Earthquake” were invited to give lectures on seismometric training courses of the Seismological Bureau of Inner Mongolia. Many of the participants found it difficult to define the definition of “shadow earthquake” and its physical meaning. What is a “Cinema Earthquake”? Some people literally, defined as “occurred in the shadow of the earthquake.” I asked the trainee: “Where is the shadow?” Replied: “In the low-speed underground.”