In a significant geological development, the 4.4 magnitude earthquake that rattled various cities in Southern California was found to have originated from the Puente Hills Thrust Fault System, a particularly destructive fault in the region. This fault line is an immediate concern due to its location beneath millions of residents, reaching from USC through downtown Los Angeles to Pasadena, extending as far as northern regions of Orange County.
A study from 2005 forecasted potentially calamitous consequences if a massive quake—in the range of magnitude 7.5—were to strike the fault. While such earthquakes are expected only once every few thousand years, the impact of such an event would be deadly, potentially causing the death of thousands. It should be noted, however, that many improvements have since been made regarding building structures and city designs to minimize the potential harm these quakes could cause.
The destructive potential of the Puente Hills Thrust Fault System is not theoretical. A magnitude 6 earthquake originating from this fault in 1987 resulted in approximately $350 million in damages and three direct deaths. Modeling suggests that a 7.5 quake from the same fault could cause damage that’s 10 times worse compared to what could be unleashed by similar earthquakes along the San Andreas.
Despite its potential for significant damage, Puente Hills Thrust Fault System is relatively slow-moving, with an estimated occurrence rate of one earthquake for every 20 earthquakes along the San Andreas Fault. Meaning, while the damage may be severe, such events are notably rare.
This week’s earthquake serves as a wake-up call for Southern California’s residents. Indeed, all who reside in the Los Angeles Metropolitan Area are within a five-mile radius of an active fault, reminding inhabitants they live in the heart of earthquake country.
The unpredictability of these events means that lives can’t be lived in constant fear; instead, measures should be taken proactively to prepare for any eventualities. In fact, while experts cannot predict which fault will become active during an individual’s lifetime, they recommend focusing on making homes and buildings safer. Much of the potential damage from earthquakes is preventable given proper precautions.
Despite the inherent uncertainty surrounding earthquakes, the basic fact remains: this recent quake underscores the importance of individuals taking responsibility for their safety by implementing measures to secure their houses and localities. Remember, our last defence against earthquakes is readiness.
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