Earth tremors in Valencia were caused by undersea gas plant, report confirms

Scientists link offshore Castor storage project to seismic activity recorded in Castellón last year Plant has been shut since quakes, the biggest of which measured 4.2 on the Richter scale

Elena G. Sevillano
The processing platform for the Castor gas storage plant is installed.
The processing platform for the Castor gas storage plant is installed.Gudnus.com

An official report has officially confirmed for the first time that there is a “direct relationship” between the 512 earth tremors recorded in Vinaròs in Castellón province last September and the injection of gas into the nearby Castor offshore storage plant. The National Geographic Institute (IGN), one of two public organizations asked by the government to conduct a detailed study into the causes of the quakes in the Valencia region, concluded: “Everything indicates that the induced seismicity is the result of gas-injection activity.” Local residents felt 15 of the tremors, the biggest of which measured 4.2 on the Richter scale. The government ordered activity at the plant to be stopped on September 26 last year, after the first 200 quakes.

Making use of a depleted oil field 1,700 meters below the sea, the Castor gas-storage plant was being built to hold a quantity of natural gas equivalent to the country’s total consumption over a period of 17 days, in order to cover spikes in consumption levels and interruptions to the supply. Liquid natural gas is supposed to be piped into the empty Vinarós Castellon oil field, via a 13.6-mile-long offshore pipeline. A 19-bank international consortium, five of whose members are Spanish, provided the $1.6 billion in financing for the project.

More information
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Residents want answers, as seismic activity increases

The IGN report ruled out that the seismic activity had its origins in the Amposta fault line – upon which the plant is built – as was first suspected. “We’re dealing with another fault, one that is not mapped,” it said. “The injection of gas has accelerated a seismotectonic process with a build-up of forces that already existed in the area, but that had not been categorized before,” it added.

Two other big fault lines, plus many other unmapped, smaller ones, also lie nearby. Several geologists consulted by EL PAÍS pointed to these as to blame for the quakes several months ago. One of them, according to the IGN report, has a “direct relation” to the seismic activity.

The IGN experts have not advised the government over what decision to take, despite a request to do so by the Industry Ministry, nor did they predict what might happen if the installation restarted the gas injections.

Local residents felt 15 of the earth tremors last September

United Left congressional deputy Ricardo Sixto had asked to see the contents of the report at the start of the year. But despite being dated December 17, 2013, it was not delivered until April 10 of this year. “The experts say that the studies are still insufficient, which is to say that they don’t know what might happen,” said Sixto. “The platform must remain closed. The closure must cost citizens nothing; we do not have to pay for the wrong decisions that some make,” he added. He said he would seek explanations over the delay in sending the report.

The decision on whether or not to definitively close the plant is one that Industry Minister José Manuel Soria has been putting off for several months. The other report his ministry has commissioned on the issue, from the Geological and Mining Institute of Spain (IGME), has yet to reach Congress. A first version was released in November 2013, which was then revised before the definitive report was delivered in February, according to sources with knowledge of the process. But the ministry has since refused to make it public, despite requests to do so by EL PAÍS.

The plant is designed to  cover spikes in consumption levels and interruptions to the supply

But Soria’s decision does not solely relate to energy planning; it is the economic consequences that most worry the government. Escal UGS, the company controlled by Spanish construction giant ACS that manages the plant, has the right to hand back the concession it was awarded for 25 years and receive back the net book value.

According to the Industry Ministry’s calculations, the Castor project has cost €1.702 billion. The government has tried to free itself from that obligation, but last October the Spanish Supreme Court rejected its request to cancel the compensation.

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