- Letter
- Open Access
The seismological and geodetical roles of strain seismogram suggested from the 2004 off the Kii peninsula earthquakes
- Makoto Okubo18Email author,
- Yasuhiro Asai18,
- Harumi Aoki18 and
- Hiroshi Ishii18
https://doi.org/10.1186/BF03352567
© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2005
Received: 30 November 2004
Accepted: 8 April 2005
Published: 24 June 2014
Abstract
Dynamic strain seismograms obtained by high-speed sampling include not only long-period changes, such as ‘strain-step’, step change in strain, but also short period variations, such as body waves. We studied dynamic strain variations caused by the 2004 off the Kii peninsula earthquakes. Using such strain seismograms, we clarified the relation between dynamic strain and velocity. Our results will contribute greatly to seismology. We also clarified the strain-step formation process. This result and the concept of dynamic strain will bring more information to geodetics.
Key words
- Dynamic strain seismogram
- broadband velocity seismogram
- global/local structure
- strain-ramp function
- geodetical strain-step
