Bosai Solution ID : JBP00118

Geo-Seismo
service -- earthquake and building monitoring

Vibration monitoring service for buildings during earthquakes using Geo-Stick,an originally developed acceleration measurement sensor

HazardEarthquake

Solution Purpose
Prevention & Mitigation

Solution Theme
Risk Assessment Disaster Prevention Plan Infrastructure Technology Building Technology Information &Communication Technology Education & Training

Technology Subject
Risk Monitoring Business Continuity Plan Urban Design & Construction of Resilient Building Resilience
Improvement on Existing Building Mitigation Measures for Interior & Facility Information Gathering
Information Analysis & Judgement Information Communication Training & Exercises

Advantages
Remote, large-scale seismic monitoring is now possible using the cloud. Data obtained during＜ Downloaded from www.bosai-jp.org ＞

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earthquakes contribute to the study of the degree of building damage due to major earthquakes, whiledata from small- to medium-scale earthquakes provide information on the integrity and risk of thebuildings and the ground.

Solution Illustrated
Once Geo-Stick installed in a building detects an earthquake, it sends acceleration data to a gateway
computer. The data are then transferred to the cloud, and an administrator is notified of the analysis
results via email and can view them in a browser.

Background
With concerns over the possibility of earthquakes occurring directly under the Tokyo metropolitan area
and in the Nankai Trough, the need has arisen to determine the possibility of continued use of buildings
after the major earthquakes based on building vibration data. This is part of the so-called business
continuity plan. It is also important from the perspective of disaster prevention to determine the seismic
resistance of buildings based on data from small and medium-scale earthquakes that occur on a daily
basis and, if necessary, to base-isolate or reinforce the building against the earthquakes.
Considering this background, Geolab has launched an efficient earthquake monitoring service using thecloud.

Exposition of the Solution
Geo-Stick, an acceleration measurement unit, has been developed to record building vibration during
earthquakes.

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Acceleration data measured by Geo-Stick are sent to the cloud, and then the maximum accelerationand maximum interlaminar deformation angle for each floor are calculated. With these values thedegree of damage is determined in comparison with threshold values.

In addition, the integrity of the building and the risk during major earthquakes are evaluatedconsidering the followings:
Changes in tilt of Geo-Stick installed floor
Variation of the first-order natural frequency estimated from the ratio of acceleration amplitude
spectra of the top floor and the first floor.
Assumption using the relationship between measured seismic intensity, maximum acceleration, andmaximum interlaminar deformation angle on the first floor during the major earthquakes.
●●●Achievements of Examples
Geo-Seismo has been installed in approximately 250 buildings as of August 2023.

Corporate Profile
Geoscience Research Laboratory
JM Bldg.4F, 3-1-6 Yamatohigashi, Yamato, kanagawa, 242-0017, Japan Tel. : +81-46-200-2281
 E-mail : chisouken@geolab.jp
 Website : https://www.geolab.jp/＜ Downloaded from www.bosai-jp.org ＞

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