SDAG Monthly Meeting
Wednesday, April 19, 2017
Catalina Room (southern end of MVCC)
Marina Village Conference Center
1936 Quivira Way
San Diego, CA 92109
FROM INTERSTATE 5: Take the SEA WORLD DRIVE exit. From SEA WORLD DRIVE,
take WEST MISSION BAY DRIVE on your right. When you see the large green sign that
says QUIVIRA ROAD, get in the farthest left of the two left turn lanes. Turn left, go one
very short block and turn left again. Drive about one half mile and MARINA VILLAGE will
be on your right.
FROM INTERSTATE 8:Exit at SPORTS ARENA BLVD., then take WEST MISSION BAY DRIVE exit to the right.
You will be on INGRAHAM STREET for a short distance from which you will take the next exit
marked WEST MISSION BAY DRIVE on your right. When you see the large green sign
that says QUIVIRA ROAD, get in the farthest left of the two left turn lanes. Turn left, go
one very short block and turn left again. Drive about 1/2 mile and MARINA VILLAGE will be on your right.
Menu: Traditional Buffet - Mexican Theme. Cash bar (Walawender Tavern)
Cost: $30.00 for non-members, $25.00 for members, $15.00 for students.
if pre-registered by the deadline, $5 extra if you did not make a reservation.
Click the SDAG member checkbox on the reservation form if you are a member.
Make your reservation online by clicking the button below
no later than NOON, Monday, April 17.
RESERVATIONS CANNOT BE ACCEPTED AFTER Monday at noon.
Late reservations/cancellations are preferred over walk-ins or no-shows.
Fees payable at the meeting or pre-pay with PayPal.
As a new payment option, there will be a phone credit card reader at the meeting.
IF YOU DO NOT MAKE A RESERVATION, WE CANNOT GUARANTEE YOU A MEAL.
If you are a current SDAG member and are not getting e-mail announcements,
make sure the SDAG secretary has your correct e-mail address.
Speaker: Dr. John Minch
"The Kobi, Japan Magnitude 7.3 Earthquake on January 17, 1995; A First Hand View of Some Damage and Reconstruction"
Japanese building codes are as strict as any in the world as Japan lies at the convergence of three oceanic plates. Kobi was caught unaware as the earthquake occurred at a shallow depth on a secondary fault just beyond the modern port city's harbor. Kobi was the first urban area since World War II to sustain a direct hit from an earthquake more powerful than 7 on the Richter scale.
In early 1995 I was with a group that was building houses in Taiwan. We were asked to come to Kobi by a Japanese conglomerate after the Kobi earthquake. We were finally allowed to arrive in Kobi on April 19, 1995, three months after the, January 17, 1995, magnitude 7.3 earthquake.
Our first introduction to the damage was the evidence of liquifaction as our Hydrofoil, from Osaka, approached the dock. The only evidence of the uniform settling was the fact that the harbor area and streets were 3-5 foot lower and undamaged. Structures with firm foundations were generally undamaged.
By the time we arrived in Kobi most of the rubble had been cleared from the downtown area. Reconstruction was well under-way and many buildings were being demolished by interesting methods. Damage was still very apparent. The photographs in this presentation were taken during the following week as we were introduced to Japanese construction and building process.
For high-rises the pre-1981 version of the building code allowed a weaker superstructure beginning at the fifth floor. Many of these high-rise buildings collapsed at the fifth floor. Adjacent buildings built after 1981 were standing and apparently unscathed.
Wood-frame-and-stucco houses, without adequate shear panels were especially vulnerable. Many wooden houses collapsed during the shaking due to the shear force of their heavy ceramic tile roofs, popular in Japan.
A look at the demolition efforts was especially revealing as they lifted bridges and built columns under them and tore down buildings from the inside with track-hoes, sometimes.
The existing California building code may not be as strong as engineers believed. Tightening building codes, to say nothing of retrofitting, will be extraordinarily expensive. But probably not as expensive as the billions of dollars in damage that a quake beneath L.A. could inflict.
Upcoming SDAG meetings - 2017
May 17: John Wallace and Pat Shires - Sycamore-Ranchito Landslide - Santa Barbara
June 21: Jorge Ledesma Baja California, Mexico
July: Joint Meeting with South Coast
Meetings are usually scheduled for the 3rd Wednesday evening of the month.
Meeting information on this website is normally updated the second week of the month.
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The submittal deadline for the next SDAG newsletter is the last Friday of the month.