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Date: Fri, 18 Aug 2000 17:32:37 +0900
To: [log in to unmask]
From: Taizoh YOSHINO <[log in to unmask]>
Subject: Ongoing crustal deformation
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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=20
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=20
continued around Miyakejima and Niijima-Kodushima=20
since the end of June.
The results from geodetic and geophysical observations=20
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=20
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
=20
As far as I know, this is the most significant crustal deformation=20
detected by the VLBI network.=20
We can learn much from the ongoing phenomena=20
by the Keystone VLBI observation system=20
connected via a high-speed network.
The geodetic result is available almost 30 minutes=20
after the last observation of the 24 hours session.=20
Currently, the VLBI session runs every day to watch the special event.=20
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.
=20
Best regards,
=20
T. Yoshino
-----------------------------------
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/
-----------------------------------
-----------------------------------
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/
-----------------------------------
