- © 2014 by the Seismological Society of America
In the last decade, the number of seismic stations has increased significantly, and new denser regional networks with advanced technology have been installed worldwide. Moreover, the recent improvements in the quality of seismological instruments have resulted in the application of modern broadband seismometers with high dynamic range digitizers for most seismological studies. Among various seismic data, broadband networks provide valuable data for seismological research. Broadband systems are being widely used in many research areas, such as seismic source studies and frequency‐dependent attenuation in the Earth, particularly from body waves and moment tensor solutions (Marshall et al., 1972; Douglas, 2001).
Tectonically, the Iranian plateau is located in the central part of the Alpine–Himalayan orogenic belt, which is known as one of the most active seismic regions of the world. Many major and strong earthquakes have occurred in Iran during its history (Berberian and Yeats, 1999). The 1962 Boen‐Zahra Ms 7.2, 1978 Tabas Mw 7.4, 1990 Manjil Mw 7.4, and 2003 Bam Mw 6.4 earthquakes are among the deadliest earthquakes in the world. Installation of broadband networks greatly helps to monitor the seismicity of the country, obtain accurate crustal velocity models, and study source characteristics.
In Iran, major activities related to monitoring of earthquakes are carrying out by the seismography networks of the Geophysical Institute of Tehran University (IGTU) and the broadband seismic network of the International Institute of Earthquake Engineering and Seismology (IIEES). The main purpose of the IGTU network is the determination and announcement of location and magnitude of earthquakes around the country; the IIEES network is mainly used for research purposes. Local networks also have been installed in some provinces and cities, including the seismic network of Khorasan (operated by Mashhad University) and an affiliated network of seismic monitoring of the Tehran Disaster …