Double Earthquakes, Their Nature, and Forecast by the Method of Seismic Entropy

Resumo

Double earthquakes are strong earthquakes close in time, place, and magnitude. They are quite rare and hard-to-explain events. It is important to clarify the nature of their occurrence for earthquake forecasting. The method of seismic entropy, involving the results of studying the processes in the sources of strong earthquakes, allows one to identify the nature of such earthquakes, to recognize them as independent earthquakes with a specific tectonic relationship, to distinguish them from other cases of close but independent earthquakes, as well as to identify them against the background of foreshocks and aftershocks. Double earthquakes are found in the seismic systems located in the different seismotectonic situations in Altai, the Kuril Islands, and the central United States, but Pakistan should be acknowledged as their “homeland.” Characteristic features which were used to classify these earthquakes are studied.