measuring the pressure of a volcano's magma chamber, indirect calculations of the type used by NRIESDP are speculative and unverifiable. Other indicators suggestive of heightened eruptive danger, such as active fumaroles and recently discovered faults, are typical occurrences at this type of volcano. Aokigahara forest The forest at the northwest base of the mountain is named Aokigahara. Folk tales and legends tell of ghosts, demons, Yūrei and Yōkai haunting the forest, and in the 19th century, Aokigahara was one of many places poor families abandoned the very young and the very old. Aokigahara is the world's third most popular suicide location after San Francisco's Golden Gate Bridge and the Nanjing Yangtze River Bridge. Since the 1950s, more than 500 people have died in the forest, mostly suicides. Approximately 30 suicides have been counted yearly, with a high of nearly 80 bodies in 2002. The recent increase in suicides prompted local officials to erect signs that attempt to convince individuals experiencing suicidal intent to re-think their desperate plans, and sometimes these messages have proven effective. The numbers of suicides in the past creates an allure that has persisted across the span of decades. Many of these hikers mark their travelled routes by leaving coloured plastic tapes behind as they pass, causing concerns from prefectural officials with regard to the forest's ecosystem. Adventuring Transportation The closest airport with scheduled international service is Mt. Fuji Shizuoka Airport. It opened in June 2009. It is about from Mount Fuji. The major international airports serving Tokyo, Tokyo International Airport (Haneda Airport) in Tokyo and Narita International Airport in Chiba are approximately three hours and 15 minutes from Mount Fuji. Climbing routes Approximately 300,000 people climbed Mount Fuji in 2009. The most popular period for people to hike up Mount Fuji is from July to August, while huts and other facilities are operating and the weather is warmest. Buses to the trail heads typically used by climbers start running on July 1. Climbing from October to May is very strongly discouraged, after a number of high-profile deaths and severe cold weather. Most Japanese climb the mountain at night in order to be in a position at or near the summit when the sun rises. The morning light is called goraikō, "arrival of light". There are four major routes to the summit, each has numbered stations along the way. They are (clockwise, starting North): Kawaguchiko, Subashiri, Gotemba,