Almost 3,000 years after the supposed destruction of a major
According to the Second Book of Kings, the mighty city of Gath was captured and ransacked by the forces of Hazael, king of Aram-Damascus. Radiocarbon dating of a “well-defined destruction layer” within the archaeological site of Tel es-Safi has since suggested that the event took place around 830 BCE.
However, in
Such an interpretation is at odds with the widely accepted notion that kiln-fired mud bricks only became widespread in the Levant during Roman times, and that prior to this, structures were typically built with
Describing the method in a
“Heating to 200°C [392°F] or more, as happens in a fire, releases the magnetic signals of these magnetic particles and, statistically, they tend to align with the Earth’s magnetic field at that specific time and place,” he said. Thus, unlike sun-dried clay, a fired brick “attains a strong and uniformly oriented magnetic field, which can be measured with a magnetometer. This is a clear indication that the brick has, in fact, been fired.”
It therefore stands to reason that if the wall was
To determine whether the bricks’ fields were aligned or not, the study authors used a technique called thermal demagnetization. This involves heating the clay in a special oven that neutralizes the Earth’s magnetic field.
During this process, the material becomes demagnetized when exposed to the same temperature that originally caused it to magnetize. Using this method, the researchers were able to determine the exact temperatures that the bricks were initially heated to, while also confirming that their magnetic fields all pointed in the same direction.
“Our findings signify that the bricks burned and cooled down in-situ, right where they were found, namely in a conflagration in the structure itself, which collapsed within a few hours,” explains Vaknin. “Had the bricks been fired in a kiln and then laid in the wall, their magnetic orientations would have been random.”
In addition to corroborating the
“Our findings indicate that the brick firing technology was probably not practiced in the Land of Israel in the times of the Kings of Judah and Israel,” concludes study author Erez Ben-Yosef.
The study is published in the journal