沙脉和沙火山不是一种罕见的地质现象,在国外早有报导和研究。近十几年来,在我国,由于地震地质研究的不断深入,沙脉、沙火山屡有发现,本文就其特征及与地震的关系作一初步探讨。1.沙脉和沙火山的特征(1)沙脉构成沙脉的碎屑物主要是粉砂和各种粒径的沙,个别为细砾和粘土质。沙脉以各种角度切割围岩,少数与围岩层理平行,但大多数是直立或近于直立的。沙脉无论在走向上和 Sand and volcanic sand is not a rare geological phenomenon, has long been reported and studied abroad. In recent ten years, in our country, due to the deepening of the research on seismic geology, the sand veins and the volcanic sand volcano have been found frequently. This paper makes a preliminary study on its characteristics and the relationship with the earthquake. 1. Characteristics of sand and sand volcanoes (1) Sand veins The debris that makes up the sand veins is mainly silt and sand of various particle sizes, with fine gravels and clays individually. The sands cut the wall rock at various angles, with a few paralleling the wall rock formation, but most are upright or nearly upright. The sands both go up and down