"Zemletrusk" is a research book that reveals to the reader all the mystery and power of natural phenomena that occur in the depths of the Earth. The authors, Louis Charles Pakiser and Kay M. Shedlock, are specialists in the field of seismology, and have done their best to make this publication accessible to the general public. They share their knowledge and research on the nature and causes of earthquakes, revealing the mysteries of tectonic activity and its impact on our lives. This book will be useful both for professionals in the field of geology and for anyone interested in natural phenomena and wanting to learn more about how our planet works.