Study Explains Gofar Fault’s Magnitude-6 Quakes Every 5 Years Through Seawater-Fed Barrier Zones
Updated
Updated · ScienceAlert · May 22
Study Explains Gofar Fault’s Magnitude-6 Quakes Every 5 Years Through Seawater-Fed Barrier Zones
4 articles · Updated · ScienceAlert · May 22
A Science study says seawater seepage helps create barrier zones that repeatedly cap earthquakes on the Gofar transform fault at about magnitude 6 every five to six years.
Data from ocean-bottom seismometers deployed in 2008 and 2019-2022 captured tens of thousands of small quakes, showing two Gofar segments with barrier zones ruptured in strikingly similar ways.
Those zones are networks of small faults: as main shocks begin, fluid-filled rock expands, water rushes in, pressure changes rise, and the rock locks up—stopping rupture from growing into larger earthquakes.
The fault, west of Ecuador where the Pacific and Nazca plates slide past each other at about 140 millimeters a year, has shown this regular pattern since records began in 1995.
Researchers say similar mechanisms may limit other oceanic transform faults worldwide, offering better constraints for earthquake models even though Gofar itself poses little direct risk to populated areas.
Could the secret to predicting major land-based earthquakes be hidden deep within these oceanic faults?
If some faults have natural brakes, what makes others like the Cascadia fault so dangerously unpredictable?
The Gofar Fault’s Predictable Quakes: How Fluid-Saturated Barriers Limit Earthquake Size
Overview
For decades, scientists have been puzzled by the Gofar transform fault, which produces magnitude 6 earthquakes with remarkable regularity. This unusual pattern is due to special 'barriers' within the fault that consistently stop earthquakes from becoming larger and more destructive. The true nature of these barriers remained a mystery, as researchers questioned what made them so reliable. Recent breakthroughs revealed that these barriers are not just passive features but active, dynamic parts of the fault system. Understanding how these barriers work is key to explaining Gofar's precise seismic behavior and could improve our knowledge of earthquake mechanics worldwide.