When a quake measuring 6.8 as on the Richter scale struck the Kashiwazaki-Kariwa nuclear plant earlier this week causing radiation leakage, it raised alarm among the public and shook the government's plans to expand its nuclear power industry, both at home and as a potential export product. The only reason a real disaster was averted is largely due to Japan's extremely strict building laws.

The quake killed nine people, left more than 1,000 injured, and forced thousands out of their homes and into makeshift shelters. But the quake also revealed something far more frightening for the safety of the world at large: If Japan, with all its preparedness and its advanced technology, succumbed to such an unfortunate -- and hazardous -- accident, what would happen in the eventuality of Iran's nuclear installations being hit by a similar quake, or one even more powerful?

The earthquake that shook the seven nuclear power plants in the Kashiwazaki-Kariwa complex was designed to withstand the force of a 6.5 quake. As it turned out, the quake registered 6.8 and caused about 50 different problems at the power plant, such as a fire, nuclear material seeping into water, and -- unbelievable as it may sound -- caused more than 400 drums containing low-level radioactive waste to topple over. And due to the severity of the quake, some of the drums broke open.

And that happened in a country that takes its earthquake preparation very seriously. The architects of the plants had considered it unlikely that an earthquake would affect the plant in such a way. The Japanese have installed extremely advanced safety standards aimed to cut down possibility of accidents happening, such as the ones that were caused by the quake.

It took about two hours for firefighters to extinguish the fire that had broken out as a result of the earthquake. This was the first time a nuclear plant was hit by an earthquake in Japan. Officials the next day spoke of reports "of a leak of radioactive water from one of three reactors into the Sea of Japan."

The Kashiwazaki-Kariwa nuclear-power complex, one of the world's largest nuclear plants, is run by the Tokyo Electric Power Co. With its seven reactors, it has a capacity to generate about 8,000 megawatts.

Now what would happen if the scenario was to unfold in Iran, where the building codes are not nearly as strict as those of Japan, and several of Iran's nuclear facilities are situated near highly populated urban areas?

The outcome of a tremor similar to the one that struck Japan earlier in the week, or one of a stronger magnitude in Iran, would have devastating consequences. Leakage from one of Iran's nuclear facilities would send deadly clouds of nuclear material floating over densely populated areas. The results would be catastrophic, and not only for Iran. Depending on weather conditions, the lethal and invisible clouds could find themselves drifting over parts of the Gulf states, such as Kuwait, Bahrain, Qatar and the United Arab Emirates, or possibly parts of Saudi Arabia and Iraq, contaminating oil facilities -- the fields, refineries and oil terminals where the oil is pumped into giant tanker ships that then transports the oil to markets in Europe, Asia and the Americas.

Should one or more of the giant oil facilities, such as Saudi Arabia's installations at Abqaiq, become contaminated by nuclear fallout from one of Iran's nuclear power plants, either due to a powerful earthquake or other natural or man-made disaster, the result would be devastating, not solely on the economic level, but also the effect it would have on the heath of the area's population.

We have seen the results of what happened at the Chernobyl nuclear reactor, and the devastation it took on the people living and working in the vicinity of that station. All the precautions, safety measures and goodwill in the world might not be enough to deter what happened in Japan's nuclear power plant from happening in Iran.

Under such a nightmare scenario, the price of oil would shoot up to well beyond $100 per barrel. Depending on the intensity of the accident and how much nuclear material was released into the atmosphere and how much of it drifted over the producing states, an accident of the type described here could send the oil markets spiraling out of control.

Ironically, the country that would be the hardest hit would be Iran. Having no oil refining facilities of its own, Tehran relies on third countries -- mostly India -- to refine its oil and ship it back. But in the event of a nuclear disaster in the Persian Gulf region, Iran may find itself isolated, unable to send its crude oil out of the country for refinement. And the nuclear power plants the Islamic Republic claims it is building to produce electricity would find themselves incapacitated.

Earthquakes are highly unpredictable. Constructing nuclear power plants in areas prone to earthquakes is playing with fire, literally.

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