First, all the active faults in Southern California, such as the San Andreas and the San Jacinto...
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First, all the active faults in Southern California, such as the San Andreas and the San Jacinto faults, were examined. Then, the fault lines were displayed
First, all the active faults in Southern California, such as
the San Andreas and the San Jacinto faults, were examined. Then,
the fault lines were displayed via a 3D imaging program called
Fledermaus. Afterward, the most significant earthquakes that
occurred on each fault were studied. The data showed that the
largest recorded earthquakes in Southern California were the
Landers earthquake and the Hector Mine earthquake. Lastly, the
magnitudes and depths of each earthquake since 1982 were reseached
and plotted.
Slide 3
Southern California Fault Map Key for the Faults SA = San
Andreas Rn = Rinconada Hos = Hosgri SJ = San Juan Oz = Ozena BP =
Big Pine PM = Pine Mountain SY = Santa Ynez SC = San Cayetano SS =
Santa Susanna Oak = Oakridge MC = Malibu Coast SM = Santa Monica SN
= Sierra Nevada WW = White Wolf Gar = Garlock Bw = Blackwater Ha =
Harper Lck = Lockhart Hel = Helendale Ln = Lenwood Cal = Calico Ps
= Pisgah Lud = Ludlow Bul = Bullion PtM = Pinto Mountain Blu = Blue
Cut SG = San Gabriel SiM = Sierra Madre PV = Palos Verdes N-I =
Newport-Inglewood Wh = Whittier SJc = San Jacinto Ban = Banning HS
= Hot Springs Els = Elsinore SsH = Superstition Hills SsM =
Superstition Mountain Imp = Imperial
Slide 4
Total Number of Earthquakes 57,973 total earthquakes from
1982-2005 49 earthquakes >M5 8 earthquakes > M6 2 earthquakes
>M7 The two earthquakes greater than M7 were the Hector Mine and
Landers earthquakes
Slide 5
Date of Earthquakes vs. Magnitude of Earthquakes The magnitudes
of most earthquakes are within the range of 0-4 As the years
progress, more earthquakes are recorded as technology improves
Slide 6
M (1-3)M (3-4) M (4-5) M (5-6) M (6-7) M (7-8) Magnitudes
Slide 7
Date of Earthquakes vs. Depth of Earthquakes 1977-1988: the
earthquakes were all between the depths of 17-21 km 1988: the
deepest earthquake occurred After 1988, depths dropped 1999: depths
rose again due to the Hector Mine earthquake
Slide 8
1982-1985 1986-1990 1991-1995 1996-2000 2001-2005 Years
Slide 9
Hector Mine Earthquake (1999) Landers Earthquake (1992) M (1-3)
M (3-4) M (4-5) M (5-6) M (6-7) M (7-8) Magnitudes
Slide 10
Struck on the eastern side of the San Bernardino Mountains at
4:57 A.M on June 28, 1992 Magnitude of 7.3 Largest earthquake to
hit Southern California since the Kern County earthquake in 1952
with a magnitude of 7.7 The type of faulting was right- lateral
strike-slip One person killed, 25 people seriously injured, 372
people treated for earthquake related injuries Total property
damage value was about $56 million Occurred on the Lenwood
fault
Slide 11
Occurred 2:46 A.M on Saturday, October 16, 1999 The largest
earthquake since the M7.3 Landers earthquake Occurred on the Calico
fault Magnitude 7.0 Only lasted about ten seconds The type of
faulting was a right-lateral strike-slip
Slide 12
In conclusion, Southern California is located on one of the
most active faults, the San Andreas Fault. Also, the largest
earthquakes ever to occur in Southern California are the Landers
(1992) and Hector Mine (1999) earthquakes. Although we do not know
when the big one will hit Southern California, our technology will
keep improving to make our cities safer and to make sure everyone
is prepared.
Acknowledgements: We would like to thank our instructors, Dr.
Benson Shing, Bridget Smith, & Andreas Stavridis for teaching
us about the structures during earthquakes and geophysics of
earthquakes, Jon Deck and Allison Jacobs for helping us every step
of the way, and our teacher fellow, Jerry Lederman, for always
being there for us.
