KVIS-ISF5.html

For The 5th KVIS-ISF Teachers and students January 25 2022 Yoshio Okamoto <yossi.okamoto <at mark> gmail.com>

This page is for Teacher Sharing participants at The 5th KVIS-ISF.

1. Epicenter finding exercise

<Procedure> All images can be available to click thumbnails.

The following data from USGS significant earthquake
https://earthquake.usgs.gov/earthquakes/browse/significant.php
This example is:

2019-12-15 06:11:51 (UTC)
6.697°N 125.174°E
M 6.8 18.0km_Depth S of Magsaysay, Philippines

https://earthquake.usgs.gov/earthquakes/eventpage/us60006rp9/executive

1) Measure the S-P times[min] from the following seismograms

    Key Point: the arrival time of S-wave is found at the sudden change of amplitude and period of waves
                Usually, the S arrival is easily found on the Horizontal components: N-S or E-W while, P arrival is on U-D comp.

    KVIS (Click thumbnail to the image)

Osaka(Sayama)

2) Convert S-P time[min] to Epicentral distances[km] using the following chart (Okamoto, 2022 not published yet)

3) Using compasses to draw two circles on the following map and find the epicenter

4) Compare your epicenter with the USGS epicenter

    https://earthquake.usgs.gov/earthquakes/eventpage/us60006rp9/executive

5) Our result

    Epi-center map
    Convert chart

    KVIS-Seismogram
    Osaka-Seismogram

<Other Examples for Exercise> Click links to images

Common Map
Convert chart

2019-01-07 M6.6 43.2km, Molucca Sea
    KVIS-Seismogram
    Osaka-Seismogram

2019-05-07 M7.1 146km, NW of Bulolo, Papua New Guinea
    KVIS-Seismogram
    Osaka-Seismogram

2019-05-14 M7.6 10km, NE of Kokopo, Papua New Guinea
    KVIS-Seismogram
    Osaka-Seismogram

2019-09-26 M6.5 12.3km, NE of Ambon,Indonesia
    KVIS-Seismogram
    Osaka-Seismogram

<Our results above earthquakes and comparison with USGS report>

2019-01-07 M6.6 43.2km, Molucca Sea    https://earthquake.usgs.gov/earthquakes/eventpage/us2000j0uj/executive
    KVIS-Seismogram
    Osaka-Seismogram
    Epi-center map

2019-05-07 M7.1 146km, NW of Bulolo, Papua New Guinea   https://earthquake.usgs.gov/earthquakes/eventpage/us70003hqb/executive
    KVIS-Seismogram
    Osaka-Seismogram
    Epi-center map

2019-05-14 M7.6 10km, NE of Kokopo, Papua New Guinea     https://earthquake.usgs.gov/earthquakes/eventpage/us70003kyy/executive
    KVIS-Seismogram
    Osaka-Seismogram
    Epi-center map

2019-09-26 M6.5 12.3km, NE of Ambon,Indonesia   https://earthquake.usgs.gov/earthquakes/eventpage/us70005lfd/executive
    KVIS-Seismogram
    Osaka-Seismogram
    Epi-center map

2, Related links to my presentation

1. A real-time Movie of Mexico M8.2 waves arrived to KVIS

I was sitting in the chemistry teacher's room (KVIS 1F).
And check the signals from my seismographs set up under my desk.
Suddenly huge long-period waves appeared on the PC display.
So, I checked the USGS earthquake site
https://earthquake.usgs.gov/earthquakes/map/
and found a new red point on the Map!

htps://youtu.be/C94aG-kd8zo

These waves were traveling from the opposite side of the earth!
But I felt no tremors, only caught with high-sensitive seismographs!

The seismogram is here,

P-wave arrival closeup

USGS page of this EQ,
https://earthquake.usgs.gov/earthquakes/eventpage/us2000ahv0/executive

2. 3D printing Seismoraphs (Now developing!)

The resources (including STL files) will be uploaded to my website soon.
If you are interested in them, please send me your email,
yossi.okamoto <at mark> gmail.com

3. My home seismographs and seismograms(from my FB dairy)

http://www.yossi-okamoto.net/Seismograms/seismograms_FB.html

4. References

Yoshio Okamoto: A new horizontal seismograph system for school use employing “Arduino” and “Processing”, GeoSciEd VIII Campinas abstract, 2018
Yoshio Okamoto: Low-Cost and Easy-Made Horizontal Seismometer with Arduino for Educational Use -Demonstration and Observation-, 35th IGC Cape Town 2016 abstract
Yoshio Okamoto and Akihiko Ito: A new horizontal seismograph system for school use employing “Arduino” and “Processing”, GeoSciEd VII Hyderabad abstract, 2014

My teaching at KVIS is as follows,
Yoshio Okamoto, Janjira Maneesan and Thanit Pewnim: An earth science course at Kamnoetvidya science academy, A Thai science-oriented senior high school, GeoSciEd VIII Campinas abstract, 2018
<Japanese references>

ANB Seismograph
http://www.zisin.jp/publications/document04_04.html
http://www.zisin.jp/publications/pdf/nf-vol102.pdf#page=4
http://www.zisin.jp/publications/pdf/nf-vol103.pdf#page=6
http://www.zisin.jp/publications/pdf/nf-vol104.pdf#page=6

岡本義雄：やや本格的な教材用地震計の製作，日本地学教育学会第69回全国大会福岡大会講演予稿集，2015
岡本義雄：教材用地震観測システムの開発，大阪と科学教育 5, 9-14, 1991