|
Year |
Location |
Magnitude |
Comment |
|
1888 |
North Canterbury, New Zealand
|
7.0-7.3 |
120th Anniversary
Local time: September 1, 1888 04:10 a.m. NZST
The earthquake in northern Canterbury, some 100 kilometers
from Christchurch, caused the partial collapse of the
cathedral's spire. This earthquake originated at
a shallow depth and ruptured to the surface
along the Hope Fault, west of Hammer Springs.
This was the first scientific observation of strike-slip
faulting.
From
The how, what and where of an earthquake by Warwick Smith.
The North Cantebury earthquake
of September 1, 1888 by H.A. Cowan. (PDF)
|
The 1888 earthquake caused a 2.6-metre horizontal offset on the Hope Fault,
visible in this fenceline at Glynn Wye. The fence has been re-strung,
but the posts have not been moved.
This photograph appears to be the world's first to show horizontal fault movement
caused by an earthquake.
From
Historic earthquakes, Te Ara - the Encyclopedia of New Zealand.
(Photo by Geologist Alexander McKay)
|
|
1968 |
Dasht-e Bayaz, Iran
|
7.3 |
40th Anniversary
7,000 to 12,000 deaths.
Five villages were totally destroyed in
the Dasht-e Bayaz area, and another 6
from Kakhk to Salayan had at least half
of the buildings destroyed. A strong
aftershock on Sep 01 destroyed the town
of Ferdows (see next event). In all,
more than 175 villages were destroyed
or damaged in this rather sparsely
populated area of Khorasan Province.
Most buildings in the area were built
of adobe with very thick (1-2 m, or
about 3-6 ft) arched roofs. The walls
shattered, bringing tons of material
down on the people inside. This was a
major reason for the severity of damage
and casualties in this earthquake. The
death toll would likely have been much
higher if this quake would have struck
in the middle of the night, when many
more people would have been indoors.
The few steel-frame or brick-and-mortar
structures in the area generally
survived with only minor to moderate
damage, making it difficult to assign a
maximum intensity to the quake. The
intensity estimates range from VIII to
X. Surface faulting occurred in a zone
about 80 km (50 mi) long. The maximum
strike-slip (horizontal) offset was
about 4.5 m (15 ft) near Dasht-e Bayaz
with a vertical offset of about 2 m.
Extensive ground ruptures and sandblows
occurred in the Nimbluk Valley east of
Salayan, south of the main fault trace.
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