J. Havskov – Instrumentation in Earthquake Seismology (2016)

Автор: J. Havskov
Название книги: Instrumentation in Earthquake Seismology
Формат: PDF
Жанр: Сейсмология
Страницы: 423
Качество: Изначально компьютерное, E-book

This book first came out in 2004. Since then there has been a lot of changes in the technology used for detecting and recording earthquakes. Some recording media like tape and optical disk have completely disappeared. Seismic recorders have become smaller, using less power, and the trend is for much more standardization with Linux operating system, Ethernet communication, MiniSeed recording, and SeedLink or EarthWorm real-time transmission. Real-time transmission and continuous recording are now the norm, partly due to better communication and cheap large capacity storage. The new open standards for seismic data transmission and data storage have forced the manufacturers to offer more standardized products to the benefit of the users. Compared to 2004, there are now a lot more open seismic stations which provide free real-time access to seismic data, so it is now possible to make a seismic network without owning a single station using free data collection software. The sensor development has been significant with new very compact and easy to deploy broadband sensors, and for new networks broadband sensors are now used almost exclusively. The MEMS accelerometers are now everywhere, even in mobile phones and actually used in community seismic networks. Despite the instrument development, there are several sensors and recorders that are nearly identical to the models sold 10 years ago, so quality lasts! While no new analog stations are installed, there are still hundreds of analog stations in operation, even in very sophisticated networks, since they provide cheap reliable backup when the digital technology fails, are cheap to operate, and require little maintenance. So analog technology is still described in this book. Several equipment manufacturers have disappeared, and some new ones have come on the market. The many changes over the last 10 years have therefore required a significant revision of this book, both in terms of the technology used and new equipment available.