Local Effects on Strain Seismogram at Matsushiro Seismological Observatory - 1. Love Waves
We proposed a simple method to evaluate local effects on a strain seismogram, and applied the method to investigation of the effects at Matsushiro Seismological Observatory, Japan Meteorological Agency, central Japan, for a Love wave in a period range of 170 - 400 sec. First, we took a ratio of EW t...
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| Format: | Article |
| Language: | English |
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Springer
2007-01-01
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| Series: | Terrestrial, Atmospheric and Oceanic Sciences |
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| Online Access: |
http://tao.cgu.org.tw/images/attachments/v183p547.pdf
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| _version_ | 1811292504260083712 |
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| author | Taishi Okamoto Yutaka Ikegami Kazuya Kokubo |
| author_facet | Taishi Okamoto Yutaka Ikegami Kazuya Kokubo |
| author_sort | Taishi Okamoto |
| collection | DOAJ |
| description | We proposed a simple method to evaluate local effects on a strain seismogram, and applied the method to investigation of the effects at Matsushiro Seismological Observatory, Japan Meteorological Agency, central Japan, for a Love wave in a period range of 170 - 400 sec. First, we took a ratio of EW to NS component strain for a Love wave on a timefrequency plane. Although NS and EW component strain for a Love wave travelling in any direction have the same amplitude theoretically, the ratio of observed EW to NS component strain was 0.7. Next, we compared the strain seismogram with a velocity seismogram recorded with STS-1 broadband seismometer. A ratio of a partial derivative of a displacement field with respect to time to that with respect to wave propagation direction equals a phase velocity of the wave theoretically. Utilizing the fact, we estimated the phase velocity of a Love wave using the observed velocity and strain seismogram, after NS component strain had been multiplied by 0.7. The result was 24% smaller than the theoretical phase velocity. Finally, we compared the velocity seismogram with other velocity seismograms recorded by STS-1 seismometers at F-net observation stations near Matsushiro and by STS-2 seismometer at Matsushiro, and found that the every deviation from Matsushiro was less than 10%. From these results, we conclude that the EW and NS component strain seismograms have been amplified by factors of 1.32 and 1.88 for a Love wave, respectively. This fact, which may be because of local geology and/or topography effects, must be taken into account when the strain seismogram is used for seismological applications such as the CMT inversion and research on earth¡¦s free oscillations. |
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| id | doaj.art-d2f83362b89f4fac936072c450a35dc3 |
| institution | Directory Open Access Journal |
| issn | 1017-0839 2311-7680 |
| language | English |
| last_indexed | 2024-04-13T04:46:26Z |
| publishDate | 2007-01-01 |
| publisher | Springer |
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| series | Terrestrial, Atmospheric and Oceanic Sciences |
| spelling | doaj.art-d2f83362b89f4fac936072c450a35dc32022-12-22T03:01:50ZengSpringerTerrestrial, Atmospheric and Oceanic Sciences1017-08392311-76802007-01-0118354710.3319/TAO.2007.18.3.547(T)Local Effects on Strain Seismogram at Matsushiro Seismological Observatory - 1. Love WavesTaishi OkamotoYutaka IkegamiKazuya KokuboWe proposed a simple method to evaluate local effects on a strain seismogram, and applied the method to investigation of the effects at Matsushiro Seismological Observatory, Japan Meteorological Agency, central Japan, for a Love wave in a period range of 170 - 400 sec. First, we took a ratio of EW to NS component strain for a Love wave on a timefrequency plane. Although NS and EW component strain for a Love wave travelling in any direction have the same amplitude theoretically, the ratio of observed EW to NS component strain was 0.7. Next, we compared the strain seismogram with a velocity seismogram recorded with STS-1 broadband seismometer. A ratio of a partial derivative of a displacement field with respect to time to that with respect to wave propagation direction equals a phase velocity of the wave theoretically. Utilizing the fact, we estimated the phase velocity of a Love wave using the observed velocity and strain seismogram, after NS component strain had been multiplied by 0.7. The result was 24% smaller than the theoretical phase velocity. Finally, we compared the velocity seismogram with other velocity seismograms recorded by STS-1 seismometers at F-net observation stations near Matsushiro and by STS-2 seismometer at Matsushiro, and found that the every deviation from Matsushiro was less than 10%. From these results, we conclude that the EW and NS component strain seismograms have been amplified by factors of 1.32 and 1.88 for a Love wave, respectively. This fact, which may be because of local geology and/or topography effects, must be taken into account when the strain seismogram is used for seismological applications such as the CMT inversion and research on earth¡¦s free oscillations. http://tao.cgu.org.tw/images/attachments/v183p547.pdf Strain seismogramLove wavePhase velocity |
| spellingShingle | Taishi Okamoto Yutaka Ikegami Kazuya Kokubo Local Effects on Strain Seismogram at Matsushiro Seismological Observatory - 1. Love Waves Terrestrial, Atmospheric and Oceanic Sciences Strain seismogram Love wave Phase velocity |
| title | Local Effects on Strain Seismogram at Matsushiro Seismological Observatory - 1. Love Waves |
| title_full | Local Effects on Strain Seismogram at Matsushiro Seismological Observatory - 1. Love Waves |
| title_fullStr | Local Effects on Strain Seismogram at Matsushiro Seismological Observatory - 1. Love Waves |
| title_full_unstemmed | Local Effects on Strain Seismogram at Matsushiro Seismological Observatory - 1. Love Waves |
| title_short | Local Effects on Strain Seismogram at Matsushiro Seismological Observatory - 1. Love Waves |
| title_sort | local effects on strain seismogram at matsushiro seismological observatory 1 love waves |
| topic | Strain seismogram Love wave Phase velocity |
| url |
http://tao.cgu.org.tw/images/attachments/v183p547.pdf
|
| work_keys_str_mv | AT taishiokamoto localeffectsonstrainseismogramatmatsushiroseismologicalobservatory1lovewaves AT yutakaikegami localeffectsonstrainseismogramatmatsushiroseismologicalobservatory1lovewaves AT kazuyakokubo localeffectsonstrainseismogramatmatsushiroseismologicalobservatory1lovewaves |