Jericho Earthquake

The Jericho earthquake of 1927, also called the Dead Sea or Palestine earthquake, was one of the most destructive seismic events in the Levant in the twentieth century. Striking in the summer of that year, it shook Palestine and neighboring territories, damaged historic cities including Jerusalem, Nablus and Amman, and killed several hundred people. It remains an important reference point for understanding the region's earthquake hazard.

The quake occurred along the Dead Sea Transform, a long fault system running from the Red Sea through the Dead Sea basin and the Jordan Valley toward Turkey. Here the Arabian plate slides northward past the African plate, building up strain that is released in occasional large earthquakes. The region has a long record of such events, and historical sources describe damaging shocks in antiquity and the medieval period, including a major earthquake in 1033 and another in 1546. In 1927 the area was under the British Mandate for Palestine, and Transjordan was a separate emirate under the Mandate system. Most buildings were of traditional stone, mud brick or rubble masonry, which performed poorly in strong shaking.

The earthquake was centered in the Jordan Valley near the northern end of the Dead Sea, close to Jericho. It was felt over a very wide area, and modern estimates generally put its magnitude at around 6. Its effects were severe in towns on both sides of the Jordan. Buildings collapsed or were badly cracked in Jerusalem, Nablus, Ramla, Lydda, Jericho and Amman, and landslides were reported along the valley's slopes. Accounts of the death toll vary, but most place it at a few hundred, with many more injured. Reports also describe a temporary blockage of the Jordan River caused by landslides, though details of its extent and duration are less certain than other aspects of the event.

Because the quake took place during the era of modern instruments, it was recorded by seismographs around the world, giving scientists data that older earthquakes lacked. Even so, location and magnitude estimates have been revised over the decades, and researchers still debate exactly which fault segment ruptured. Some work has suggested that the shaking may have been influenced by the thick sediments of the Jordan Valley, which can amplify ground motion.

The earthquake prompted relief efforts by the Mandate authorities and local communities, and repairs reshaped parts of the affected towns. Its longer legacy is as a reminder that the Dead Sea Transform remains active. Later studies of the fault, together with historical records, have informed building codes and risk assessments in Israel, Palestine and Jordan, where planners continue to worry about the possibility of another major rupture.