38 North, a blog of the US-Korea Institute at Johns Hopkins University, analyzed satellite photos that it said showed possible assistance from Iran at the Tonghae Satellite Launching Ground in northeastern North Korea.
38 North said that a commercial satellite photograph taken on January 5 showed "important progress" since the area was hit with typhoons last year and indicated activity that was consistent with preparations for a launch.
But the website said there was not enough evidence to support speculation that North Korea could raise the stakes by testing its KN-08, a new missile with potential intercontinental range first displayed in a parade in April.
The website said that North Korea likely was preparing to test much larger rockets by the time the site is completed in 2016. The launchpad was last used in April 2009 for a long-range test widely seen as a failure.
The area has a new flame trench covering, which would protect large rockets from exhaust gases, that has a design similar to one used at the Semnan launchpad in central Iran, the website said.
It said that the satellite photos showed that three storage tanks were built last year that can hold 439,100 liters (116,000 gallons) of fuel, a level far above North Korea's capacity during its most recent launch.
38 North said that it also observed a conduit through which technicians and electrical and communications lines can pass, even though Tonghae is accessible only by a dirt road.
North Korea defiantly carried out its third nuclear test on Tuesday, saying it was responding to US "hostility" after the UN Security Council condemned its last launch two months earlier.
On December 12, North Korea launched a rocket from its separate Sohae site that, according to experts, managed to reach near the Philippines and to put a small satellite into orbit.
The United States and its allies condemned the launch, fearing it was part of efforts to refine a longer-range missile.
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