What other uses does a seismograph have?

In addition to detecting and measuring earthquakes, seismographs are used in various applications such as monitoring volcanic activity, studying the Earth's internal structure, and investigating the effects of human activities like mining and construction. They can also aid in assessing the stability of structures and help in engineering projects by providing data on ground vibrations. Furthermore, seismographs are essential in the field of oil and gas exploration, where they help locate subsurface resources.