Geodesy in action...
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Dr Paul Cruddace, Geodetic Adviser,
Ordnance Survey, Romsey Road,
Southampton SO16 4GU, United Kingdom.
Email: [log in to unmask]
Tel: +44 (0)23 8079 2663
Fax: +44 (0)23 8079 2351
Mobile: 07884 114460
National GPS Network: www.gps.gov.uk
OS website: www.ordnancesurvey.gov.uk
OS email: [log in to unmask]
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-----Original Message-----
From: Taizoh YOSHINO [mailto:[log in to unmask]]
Sent: 18 August 2000 09:33
To: [log in to unmask]
Cc: [log in to unmask]; [log in to unmask]; [log in to unmask]
Subject: Ongoing crustal deformation
Dear colleagues,
I would like to draw your attention to the ongoing crustal deformation
observed by the VLBI network in the Keystone project in Japan.
Since the beginning of July, the baseline length between Kashima
and Tateyama is changing by almost 2cm/month.
See "Baseline Lengths" and "Site Positions" at the following site.
http://ksp.crl.go.jp/index.html
Following the magma intrusion event at Izu Islands
about 150km south of Tokyo during 26 and 27 in June 2000,
the crater subsidence and volcanic eruption events continued in
July at Miyakejima which is one of the Izu islands. In addition,
high seismic activity and significant crustal deformation has
continued around Miyakejima and Niijima-Kodushima
since the end of June.
The results from geodetic and geophysical observations
are available from the following sites.
http://www.jishin.go.jp/main/chousa/00jul3/index-e.htm
(Only Japanese description)
http://www.gsi-mc.go.jp/WNEW/LATEST/MIYAKE/gps/gpsobs.htm
According to the model simulation by seismologists, it can be
explained that the crustal deformation is caused by the dike intrusion
at about 7km depth between the islands.
http://www.jishin.go.jp/main/chousa/00jul3/p18-e.htm
As far as I know, this is the most significant crustal deformation
detected by the VLBI network.
We can learn much from the ongoing phenomena
by the Keystone VLBI observation system
connected via a high-speed network.
The geodetic result is available almost 30 minutes
after the last observation of the 24 hours session.
Currently, the VLBI session runs every day to watch the special event.
No one knows how long this phenomena will continue.
If you have any comments on our observation, let me know that,
because our project is time limited.
Best regards,
T. Yoshino
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Taizoh YOSHINO
Project Leader
Keystone Project Team
Communications Research Laboratory
4-2-1 Nukui-kitamachi
Koganei-shi, 184-8795
Tokyo, JAPAN
TEL: +81-42-327-7560
FAX: +81-42-327-6077
http://ksp.crl.go.jp/
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-----------------------------------
Taizoh YOSHINO
Project Leader
Keystone Project Team
Communications Research Laboratory
4-2-1 Nukui-kitamachi
Koganei-shi, 184-8795
Tokyo, JAPAN
TEL: +81-42-327-7560
FAX: +81-42-327-6077
http://ksp.crl.go.jp/
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