Cities in earthquake-prone regions have developed a layered system of protections that spans building design, land use law, infrastructure engineering, early warning technology, and public education. No single strategy prevents earthquake damage on its own. The cities that fare best combine multiple approaches, from keeping buildings off active faults to installing water pipes that bend without breaking.
Building Design That Absorbs Shaking
The most visible adaptation is in how buildings are constructed. Modern seismic engineering uses two core strategies: making structures strong enough to resist shaking, and making them flexible enough to move with it. Base isolation is one of the most effective techniques. Buildings sit on flexible pads or bearings that decouple the structure from ground motion, allowing the earth to shift beneath while the building above stays relatively still. During strong earthquakes, these systems can absorb energy equivalent to 30% to 35% of critical damping, dramatically reducing the forces transmitted to the structure. The result is smaller drifts between floors, lower internal forces, and far less damage compared to a fixed-base building hit by the same quake.
Tall buildings in cities like Tokyo, Los Angeles, and Mexico City also use tuned mass dampers and other energy-dissipating systems that counteract sway during prolonged shaking. These technologies are standard in new high-rises, but the real challenge is the millions of older buildings that predate modern codes.
Retrofitting Older Buildings
Existing buildings, particularly “soft story” structures where a weak ground floor (often an open garage) supports heavier upper floors, are among the most dangerous in an earthquake. These buildings can pancake when the ground floor collapses. Cities like Los Angeles, San Francisco, and Berkeley have passed mandatory retrofit ordinances requiring owners to strengthen these vulnerable structures.
Typical retrofits involve adding steel frames or plywood sheathing to reinforce the weak ground floor, bolting the building more securely to its foundation, and adding bracing to resist lateral forces. The cost varies widely depending on the building’s size and condition. Berkeley’s Earthquake Soft-Story program reimburses eligible homeowners up to 75% of retrofit costs, capped at $13,000. For simpler residential buildings of one to four units, California’s Earthquake Brace + Bolt program offers grants up to $3,000 to cover foundation bolting and cripple wall bracing. These aren’t trivial expenses, but they’re a fraction of what rebuilding would cost after a collapse.
Retrofit mandates have been politically contentious because property owners bear much of the cost, but the engineering logic is straightforward: the buildings most likely to kill people already exist, and replacing them isn’t realistic on any meaningful timeline.
Keeping Buildings Off Active Faults
California took one of the most direct regulatory steps possible after the 1971 San Fernando earthquake. The Alquist-Priolo Earthquake Fault Zones Act prohibits placing structures for human occupancy directly over the surface trace of an active fault. Buildings must sit a minimum distance from the fault, generally at least 50 feet. Before any new development can be permitted within a designated fault zone, cities and counties require a geologic investigation to confirm the project won’t be built on top of an active fault.
This sounds obvious, but before the law passed, homes and apartments were routinely built right across known fault lines. The act shifted the burden: developers must now prove a site is safe before building, rather than waiting for an earthquake to reveal the problem. Other countries have adopted similar zoning restrictions. New Zealand, for instance, designates fault avoidance zones where certain types of construction are restricted or prohibited.
Early Warning Systems
Earthquake early warning doesn’t predict earthquakes. Instead, it detects the initial, less-damaging seismic waves from a quake already in progress and sends alerts to people farther away before the stronger, destructive waves arrive. The warning window is short but meaningful.
The U.S. ShakeAlert system, operated by the USGS across California, Oregon, and Washington, provides alert times that typically range from a few seconds to tens of seconds before shaking arrives. The longest possible warnings, 50 to 80 seconds, occur in northern California and the Pacific Northwest when users are far from the epicenter. Near the epicenter, there’s a blind zone where shaking arrives before any alert can be issued, because the system needs a few seconds to detect the quake and transmit a message.
Japan’s system, operated since 2007, is the most mature in the world and is integrated into television broadcasts, smartphone alerts, and automated systems that slow bullet trains and open fire station doors. Even a few seconds of warning lets people drop under a desk, surgeons pause a procedure, or industrial systems shut down before violent shaking starts. Mexico City benefits from a geographic advantage: its greatest earthquake threat comes from subduction zones hundreds of kilometers away on the Pacific coast, giving the city’s warning system up to a minute or more of lead time.
Resilient Water and Utility Systems
Buildings can survive an earthquake only to become uninhabitable if the water, gas, and power systems around them fail. Broken water mains were a major factor in the fires that destroyed much of San Francisco after the 1906 earthquake, and the same vulnerability persists wherever rigid pipes cross fault lines or areas prone to ground shifting.
San Francisco has addressed this by installing earthquake-resistant ductile iron pipe, manufactured by the Japanese company Kubota, at critical points in its water distribution system. These pipes have flexible joints that bend during ground displacement without breaking. The city has installed more than 17,000 feet of this pipe so far. The track record in Japan, where over 40,000 miles of the same pipe has been in the ground since 1974, is striking: zero documented leaks or breaks following major earthquakes.
Gas utilities have made parallel adaptations. Automatic shutoff valves that trigger during strong shaking are now common in Japanese and Californian homes, preventing gas leaks that can fuel post-earthquake fires. Electrical grids in seismically active regions increasingly use flexible conduit connections and automated sectionalizing switches that isolate damaged portions of the network without blacking out entire districts.
Public Preparedness and Drills
Engineering can only do so much if people don’t know how to react during shaking. The Great ShakeOut, an annual earthquake drill that began in California in 2008 and has since expanded internationally, is the largest public preparedness exercise of its kind. Millions register each year to practice the “drop, cover, and hold on” response.
Research into ShakeOut participation reveals that the drill’s value depends on how deeply people engage. Among surveyed participants, 71% practiced the basic drop, cover, and hold drill. But the group that combined the drill with interpersonal activities like attending disaster planning meetings and helping others prepare showed significantly higher self-efficacy, meaning they felt more confident in their ability to protect themselves during a real earthquake. They also scored higher on knowledge of what to do and belief that their actions would actually make a difference. Simply going through the motions of the drill improved knowledge, but the more community-oriented participants developed a broader set of skills and confidence.
Japan integrates earthquake preparedness into school curricula from early childhood, and many Japanese cities maintain neighborhood-level disaster response teams with designated roles, supply caches, and regular practice. This community-level organization was credited with saving lives during the 2011 Tohoku earthquake, particularly in areas where tsunami evacuation required rapid, coordinated action.
Adaptations in Developing Countries
The strategies above rely on engineering expertise, regulatory capacity, and money that many earthquake-prone cities simply don’t have. In countries like Nepal, Haiti, and parts of Central Asia, most buildings are non-engineered: load-bearing masonry walls made from locally available stone, brick, or adobe, with no seismic reinforcement. These structures are extremely vulnerable to collapse.
Lower-cost adaptations do exist. Confined masonry, where unreinforced brick or stone walls are built within a frame of reinforced concrete tie-columns and tie-beams, dramatically improves a building’s ability to hold together during shaking. The tie-beams are placed at different floor levels to keep the walls from separating and collapsing outward. This technique uses materials already common in local construction and doesn’t require the specialized labor that steel-frame buildings demand.
Researchers have also tested low-cost base isolation systems for unreinforced masonry buildings, using simple sliding layers between a building and its foundation to reduce the seismic forces transmitted upward. These approaches won’t match the performance of a modern engineered building, but they can mean the difference between a damaged house and a fatal collapse. The challenge is scaling these techniques across millions of existing buildings in regions with limited building inspection and enforcement infrastructure.
How Building Codes Evolve After Disasters
Nearly every major advance in earthquake adaptation has followed a catastrophic failure. California’s seismic building codes were overhauled after the 1933 Long Beach earthquake, the 1971 San Fernando earthquake, and again after the 1994 Northridge earthquake, each time addressing a specific type of failure that the previous code hadn’t anticipated. Japan’s building standards, already among the world’s strictest, were significantly tightened after the 1995 Kobe earthquake revealed that many structures built to older codes couldn’t withstand near-fault ground motion.
This pattern of disaster-driven reform means that in any earthquake-prone city, buildings of different eras represent different levels of risk. A concrete building from the 1960s and one from the 2010s may look similar from the outside but perform very differently in a major quake. Cities that have mapped their building stock by age and construction type, as Los Angeles and Istanbul have done, can target the most dangerous structures for mandatory retrofitting or replacement rather than waiting for the next earthquake to identify them.