Japanese mountaineers attempted fifteen (15) Himalayan peaks in 5-year study period. They attempted three (3) peaks per year on average.
Three fifth peaks are in Himachal Pradesh. More than one fifth peaks (26.67%) are in Jammu and Kashmir. The remaining peaks (13.33%) are in Uttarakhand. Sikkim peaks could not draw attention of the Japanese climbers.
Since they did not attempt any peak more than twice, none of the Himalayan peaks attempted satisfy the definition of top peak. They attempted all peaks except three only once. Each peak of this trio of Mari, Stok Kangri, and Unnamed-6070, located in Jammu and Kashmir, was attempted twice.
⇐ This word cloud depicts 15 Himalayan peaks attempted by Japanese mountaineers.
Altitude of these peaks varied from 5,500 meters to 7,999 meters, five (5) peak altitude categories. Japanese did not like the lowest altitude category: 5000-5499 meter.
Ten (10 | 66.67%) Japanese expeditions spent 333 days, 60.44% of total 551 days spent in exploring Indian Himalayan peaks. All these expeditions attempted peaks from 6000-6499 altitude category. Each of this expedition took 33.30 days on average.
The second most preferred altitude category was 6500-6999 meter. Two expeditions (13.33%) to this category consumed eight-five (85) days.
The remaining altitude categories recorded one expedition (6.67%) each.
In aggregate terms, average duration of the Japanese expeditions was 36.73 days.
Out of total fifteen (15) expeditions, seven (7 | 46.67%) were to JK Himalayas, six (6 | 40%) to HP Himalayas, and two (2 | 13.33%) to Uttarakhand Himalayas. However, HP expeditions (236 days | 42.83%) took slightly more days than JK expeditions (226 days | 41.02%). Uttarakhand expeditions took eighty-nine (89 days | 16.15%).
Average duration of JK expeditions was the shortest (32.29 days), followed by HP expeditions (39.33 days), and Uttarakhand expeditions (44.50 days). Average expedition duration of the last two state-specific was higher than the overall Japanese average.
All Japanese expeditions except two were 1-peak expeditions (86.67%). All multi-peak expeditions were in Himachal Pradesh. Japanese mantra one peak at a time. Isn’t it?
Sixty percent (60% | 9) Japanese expeditions were successful. Half of Japanese expeditions to Himachal Pradesh and Uttarakhand were successful. Success rate of the JK expeditions was the highest (71.43% | 5) among the Himalayan states.
26.67% Japanese expeditions failed.
The analysis concluded that the Japanese had two favorite Himalayan mountaineering destinations:
HP won on two counts: total expedition duration and total number of peaks.
JK also topped on the basis of two parameters: total number of expeditions and success rate.