Some Regularities of the Modern Seismicity of Turkmenistan and Adjacent Territory of Northern Iran

Some aspects of the seismicity of Turkmenistan and adjacent territory of Northern Iran are considered based on the ISC catalog for the period from 1964 to 2021. This period is apparently the most complete and, therefore, allows one to fairly correctly draw conclusions regarding some aspects of the seismicity of Turkmenistan and Northeastern Iran. In total, the catalog for the specified period contains about 500 events with a magnitude greater than 2.5. It is shown that the occurence graph has a negative slope slightly above average, which indicates a low value of the fractal characteristics of the environment in the Turkmenistan–Northern Iran region. Over the past 57 years, seismic activity in the region has varied from year to year. Moreover, from 1964 to 1984, seismic activity increased noticeably, and from 1985, it stabilized until 2000. From 2001 to 2004, there has been a sharp decline in seismic activity in Turkmenistan and Northern Iran, and from 2005 to 2016, a gradual increase in seismic activity in the region, followed again by a decrease. Lastly, since 2019, there has again been a significant increase in activity.