20th Century History of Whittier Fault Quakes

       The first earthquake attributed to the Whittier Fault and felt strongly in the Whittier area was an earthquake July 8, 1929 at 8:45am with an estimated magnitude of 4.7.  It was believed to be located (felt strongest) in the area of East Whittier, which had ($50,000-$350,000) damage.  It was also felt very strongly in the Los Nietos/Santa Fe Springs area where (4) people were injured. 

It is very likely that this earthquake was located on the Norwalk fault or even on the recently discovered (1999) Puente Hills fault system that runs from the Coyote Hills in North Orange County towards Brea to the east to Downtown Los Angeles towards the West (thru the Los Nietos/Santa Fe Springs area), with distinct segments underneath LA city, Santa Fe Springs, & Coyote Hills.  Several seconds of shaking were reported being felt in Los Angeles and its suburbs for a 50 mile radius around the epicenter.

       The next strong quake in the Whittier area was on the evening of June 15, 1967 centered East of Whittier.  It had a magnitude of 4.1 and was felt as a rolling quake throughout much of the LA basin and parts of Orange County, knocking objects from shelves and causing minor damage.  It may have been centered in the Puente Hills, possibly North of La Habra.

       The next large earthquake on the Whittier Fault occured on Jan. 1, 1976 at 9:20 am with a magnitude of 4.2.  It was centered in the Puente Hills of Los Angeles County and caused damage in the Whittier area.

       Then on Oct. 1, 1987, during the Centennial (100 year) Anniversary Celebration Year of the founding of Whittier, the Whittier Narrows Earthquake struck at 7:42 am with a 5.9M quake located in the Whittier Narrows region that lasted about 20 seconds and was centered near the intersection of Rosemead Blvd. and San Gabriel Blvd.  Much of the damage occurred in the older Uptown Whittier area, but there was major damage throughout the Los Angeles Basin, especially in the cities of Pasadena, Alhambra, and San Gabriel.  

It killed 8 people, injured several hundred, damaged over 10,000 buildings, and caused in excess of $350 million in property losses, mostly in the areas east and northeast of Los Angeles-mainly at Whittier.  It was felt as far away as Las Vegas, NV.  It destroyed 123 single-family homes in Los Angeles, Orange, and Ventura counties, as well as 1347 apartment units.  

Major damage was sustained to 513 single-family homes and to 2,040  apartment units.  Property damage at Cal State LA was estimated at over $20 million.  About 1400 gas leaks occurred and many fires were ignited. 

The most severe damage to transportation systems was the Interstate 605/Interstate 5 interchange, a major nine-span bridge that was built in 1964. The five supporting columns sustained severe shear fractures and the overpass was closed temporarily for a day. Minor damage also occurred on 23 other bridges in the area.

Business structures in the old Whittier commercial district were the most severely damaged by the main earthquake. In the 24-square-block shopping area known as Whittier Village, 12 commercial buildings had to be razed, and another 20 buildings were declared unsafe.

Most of the damage to buildings in the Uptown Whittier area was due to the fact that many of them were made of unreinforced brick and masonry.  About 100 chimneys in the area were knocked down as well.  Much of the rest of the damage followed the Whittier Fault trend to the northwest, especially from the Turnbull Canyon area to the area north of the inter-section of Norwalk Blvd, Workman Mill Road, and Beverly Blvd. 

Damage and dysfunction of lifelines included the often observed failure of ceramic elements on high-voltage substation equipment, damage to large liquid-storage tanks, and saturation of the telephone system with inappropriate calls.  About 1,400 gas leaks occurred on customer property, and many fires were ignited.

This earthquake sequence ruptured a small and previously unidentified, gently north-dipping,west-striking thrust fault beneath the uplifted Puente Hills and Elysian Park-Montebello Hills. 

Although many ground cracks formed along the base of the Puente Hills between Turnbull Canyon and Norwalk Boulevard, ground breakage in that area was limited to slope failures, including extensional cracks, minor landslides, and rockfalls. Ground-surface cracks also were observed at Worsham Creek oil field and Whittier Narrows golf course. 

Data obtained from monitoring the main shock and aftershocks defined a thrust fault that dips 30°N. Such a fault projects to the ground surface at Norwalk, far south of the trace of the Whittier fault. This is near the northwestern terminus of the trace of the inferred Norwalk fault,  considered as the source of the M 4.7 Whittier earthquake that occurred in 1929.

Surface and inferred subsurface geologic relationships indicate that the Whittier Narrows earthquakes did not occur on a previously known fault. A study of the seismicity of the northern Los Angeles Basin determined that concentrated seismic activity occurs near the junction of the Hollywood-Raymond fault and the projected trace of the Whittier fault.

Of the 82 incorporated cities in Los Angeles County, the cities receiving the most damage were Whittier, Monterey Park, Montebello, El Monte, South El Monte, Santa Fe Springs, Norwalk, Alhambra, Pasadena, San Gabriel, Arcadia, Monrovia, Rosemead, and Pico Rivera. Several unincorporated areas in east Los Angeles also received damage. Cities in northern Orange County, including La Habra, also were damaged.

Most seriously damaged were older, unreinforced structures — some constructed prior to 1900 — located as far away from the immediate epicentral area as Pasadena to the north and central Los Angeles to the west. Historical buildings badly damaged included the San Gabriel Mission.  Many parked automobiles were damaged by falling walls and bricks.

 Houses were partially shaken from their foundations in Whittier and chimneys were damaged at least as far away as Arcadia.  One of the eight deaths directly caused by the October 1 earthquake involved shifting earth that trapped a Southern California Edison employee in a construction excavation for an electrical power-line transmission standard in the San Gabriel Mountains. A second death was caused when a large slab of concrete from a parking structure fell onto a student at California State University, Los Angeles.

Initial strong motion data of the earthquakes released by the DMG indicated that ground shaking was intense at localities in the western San Gabriel Valley and eastern San Fernando Valley. Damage was severe along the trace of the northwestern portion of the Whittier fault in the northern “uptown” section of Whittier, and along Whittier Boulevard, two miles to the south.  The apparent south-trending pattern of the most severe damage in Whittier is similar to the pattern of intensity that took place there during the M 4.7 Whittier earthquake of 1929.

The main shock was followed by about 500 locatable aftershocks, an unusually small number for an earthquake of this magnitude. The largest aftershock, a 5.3M quake, occurred on October 4, 1987 @ 3:59 am and was located about 3km northwest of the epicenter of the October 1st earthquake.  It killed one person, injured several, and caused additional property damage in Alhambra, Los Angeles, Pico Rivera, and Whittier.

Several chimneys twisted, fell, or broke at the roofline; stone fences cracked and toppled; windows broke; and large cracks formed in sidewalks and highways. The press reported that one of the two bell towers collapsed on the San Gabriel Civic Auditorium. Also felt in Orange, Riverside, San Bernardino, and San Diego Counties.

18 Responses to 20th Century History of Whittier Fault Quakes

  1. […] Rivera, near the Pico Rivera Plaza Shopping Center, on the Whittier Fault, according to the United States Geological […]

  2. Eugene Cole says:

    Thank You for the information. On July 8, 1929 my father lived directly across the street from the East Whittier Grade School, today a middle school on the W.B. Green Ranch. The East Whittier school was nearly demolished by this quake and he stated that the Long Beach Quake several years later seemed small in comparison.

  3. Mike says:

    I was just 9 and living in Whittier when the quake of 1987 rumbled through it was my first major quake scared me a lot. Since then I have been through many others growing up in Southern California.

  4. Diana H. says:

    I remember the 1987 quake well! I was living in Pasadena and was a student at Cal State LA at the time. The young woman who lost her life on campus was in one of my classes, and it broke my heart when I later went to pick up my final exam and saw her unclaimed “A” paper in the box. The aftershocks were so frightening to me that I went with my husband on his business trip to Houston for a few days to get away from what seemed like constant shaking. I came to this article researching how many aftershocks there were following this quake, and I’m not surprised to read there were 500, although I am surprised this is a “small number for an earthquake of this magnitude.” I’m now living in Ohio and felt the Richmond, VA quake yesterday. I was curious that there was little mention of aftershocks in the news, and I just read that there have been “at least four aftershocks” recorded, which according to the National Earthquake Information Center is “remarkably low.” VERY low in comparison to what I remember from the Whittier quake! Ahh…I don’t miss the earthquakes from the west, but I do have fond memories of living there.

    • The Whitter quake of 87 was felt wide, my aunt and uncle felt it in Santa Ana, said felt very strong rolling motion, they got the ending duration of the quake.

      • Gary Cliser says:

        Living in Rancho Cucamonga, I was getting ready to pull out of my driveway to go to work… listening to KNX News Radio… I noticed my car jerk up and down, then I heard the news reporters yelling on the air… I stepped out and watched the neighborhood shake for about 30 seconds… the houses were visibly shaking.

  5. Julie says:

    I was just walking out of my apt in whittier off mills street when the quake hit. It literally threw me back and forth as I approached the front door. I locked the door, went to my car and left for work. It took me 2 hours to dive 7 miles. All lights out, whittier blvd. had most all store front windows blown out. People looked so frightened. The after shocks lasted for weeks. Being on the ground floor of apt building was very shaky. The one thing we can’t control. Nature.

  6. […] of broken glass and fallen flat-screen televisions and monitors. The fault has been responsible for a number of historical quakes, most notably the 5.9 Whittier Narrows quake of 1987, which killed 8 people and caused around 350 […]

  7. Was coyote hills part of the La Habra area?, because it the 1929 earthquake seems part or on the same fault system?

    • foreshock says:

      The Coyote Hills stretch from La Mirada to Placentia, with part of it forming the southern border of the city of La Habra between Beach Blvd and Harbor Blvd.
      It could be inferred that the 1929 Whittier quake and the 2014 La Habra quake may have occurred in the Coyote Hills segment of the Puente Hills Fault System.

      • Is it possible both the 1929 and 2014 quakes are related?

      • foreshock says:

        Hello again Mark. The two quakes may be related in that they may have occurred on the the same part of the Puente Hills Fault Zone.
        Because of the many years between the two events, the 2014 quake would not be considered an aftershock of the 1929 quake.

  8. Ann says:

    I was 12 years old at the time. My family lived in Avocado Heights. A little area around Baldwin Park. I was bused to Katherine Edwards Jr. high 10 miles away in Whittier everyday. I was standing outside of my first class with some class mates. The teacher had just arrived and was putting her key in the door. I swear the building jumped up so high I could see the other side from under it. All my class mates scattered. I only took a step back and watched as the school’s glass windows exploded outwards. Classes hadn’t started yet so all the students where in the hallways. I watched them drain into the main hallway screaming and clear out to the football field in under a minute. The principle later remarked about how impressed he was with their evacuation and nobody got hurt! I just stud there staring at my teacher in shock. I got moving when she yelled at me to follow everyone else. I did and my mom picked me up a few hours later. I remember her carefully driving around broken fences and bridges that had fallen in the street.

  9. judy page says:

    I remember it very well. I worked for a roofing company on rosemead blvd, one block from Whittier narrows. Said to be the epicenter. I’ve never felt shaking and bouncing which seemed to last forever. Everything was falling in the room, decided run out back door. That’s when I saw the roofing trucks big 4×4’s bouncing off the blacktop parking lot like a rubber ball. The front picture window cracked and window cracked all the way thru San Gabriel.

  10. Gary Cliser says:

    I remember the June 15, 1967 earthquake. I was 10 and lived in La Puente (West Puente Valley) just north of Avocado Heights. I was in bed and it slammed and shook hard for about 5 – 7 seconds. My bed slid on the tile floor. The loud rumbling was just as scary as the shaking. I later found out that the earthquake centered under La Puente and later on in years found that it was part of the Puente Hills Thrust system.

  11. G Tolmasoff says:

    I was in the Box Springs vicinity Riverside County was there was no ground movement but sound was as if a truck had it the building, a single loud bang. Without thought proceeded on days business without listening to news and arrived at Edison HQ building clueless. That building with cantilevered floors had blown its glass completely across Walnut St. where it occupied the southeastern corner

  12. G Tolmasoff says:

    I was preparing for the days project and was located in the Box Springs area of Riverside County approximately 40 miles from Whittier. I noted a loud bang as if a truck had struck the building but felt no ground movement. Wasn’t listen to news and proceeded clueless to Edison HQ. The Edison building built in a cantilevered fashion with glass shadowed and sloped to maximize light while keeping the direct sun off the glass had blown the panes across Walnut St.some only breaking on hitting the ground.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: