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Originally posted by JustMike
reply to post by Robin Marks
Robin, 17 is a prime number. (Okay yes I know you know that.)
The prime number preceding it is 13. (Ditto)
There are two main types of periodical cicadas. There's the three 17-year species, and also the four 13-year species.
Sometimes, cicadas straggle, you know. They come out early. Off-schedule. One of the most common forms of straggling involves 17-year cicadas that come out four years early -- meaning after 13 years.
Hmmm... Can that prime number oddness mean anything at all?
Locations: looking at the various maps of where the different broods live, the larger concentrations are around some central and eastern US states. The most are found in and around the regions that felt the strongest effects of the New Madrid quakes approx 200 years ago.
You have me really wondering now.
Mike
The fault runs along the Mississippi River from Memphis to St. Louis. Missouri's trouble with things natural has stretched through the spring, with the worst disaster in Joplin, where 141 people died in a May 22 tornado, the deadliest single tornado in the United States since 1947. In April, a tornado hit St. Louis, destroying up to 100 homes and damaging the Lambert-St. Louis International Airport and causing its temporary closure. Injuries were reported, but no deaths. The city is now struggling with a blazing heat wave that drove the temperature to a record 97 degrees on Monday. By Tuesday 43 cooling centers were open in the St. Louis area to help residents beat the heat. Since Saturday emergency workers have responded to 12 heat-related cases, the St. Louis Department of Health reported. And if that were not enough, the area is suffering through an infestation of cicadas, which are back in the area as part of the insect's 13-year mating cycle, making lots of noise, fouling pools and making any outdoor picnic an adventure. The bugs are harmless and should be gone in another two weeks.
Could somebody throw an eye over Krakatoa please and give me their honest opinion?
Several earthquakes have struck near south Sumatra of the 5.0 and 5.1 magnitude range today
MAP 3.0 2011/10/22 16:01:23 59.926 -152.696 84.1 SOUTHERN ALASKA
MAP 2.6 2011/10/22 15:21:57 60.096 -152.752 103.4 SOUTHERN ALASKA
MAP 4.3 2011/10/22 14:32:20 61.488 -151.937 10.0 SOUTHERN ALASKA
MAP 2.8 2011/10/22 11:46:37 39.051 -123.061 6.2 NORTHERN CALIFORNIA
MAP 4.9 2011/10/22 11:02:57 -20.146 -68.672 117.8 POTOSI, BOLIVIA
MAP 3.3 2011/10/22 10:33:41 18.306 -67.747 100.8 MONA PASSAGE, PUERTO RICO
MAP 5.0 2011/10/22 10:07:43 -18.021 -69.457 121.0 TARAPACA, CHILE
MAP 2.5 2011/10/22 09:45:45 60.319 -147.177 11.1 SOUTHERN ALASKA
MAP 5.0 2011/10/22 09:38:42 -28.853 -175.326 9.9 KERMADEC ISLANDS REGION
MAP 5.0 2011/10/22 08:34:20 -4.555 100.771 16.4 SOUTHWEST OF SUMATRA, INDONESIA
MAP 2.5 2011/10/22 07:45:44 37.854 -122.240 8.0 SAN FRANCISCO BAY AREA, CALIFORNIA
MAP 4.6 2011/10/22 07:36:03 0.095 123.729 187.0 MINAHASA, SULAWESI, INDONESIA
MAP 2.8 2011/10/22 07:06:37 37.856 -122.242 8.0 SAN FRANCISCO BAY AREA, CALIFORNIA
MAP 4.7 2011/10/22 05:24:37 -20.159 -174.038 46.9 TONGA
MAP 2.7 2011/10/22 04:14:47 38.834 -122.808 2.5 NORTHERN CALIFORNIA
MAP 3.5 2011/10/22 03:29:23 61.729 -150.908 43.6 SOUTHERN ALASKA
MAP 2.9 2011/10/22 00:22:57 57.467 -153.764 8.9 KODIAK ISLAND REGION, ALASKA
MAP 5.1 2011/10/22 00:18:02 -7.849 104.123 10.0 SOUTHWEST OF SUMATRA, INDONESIA
Reference Number 3598531
Universal Time October 22 2011 at 13:19
NZ Daylight Time Sunday, October 23 2011 at 2:19 am
Latitude, Longitude 37.35°S, 177.73°E
Focal Depth 50 km
Richter magnitude 5.0
Region Bay of Plenty
Location
40 km north of Te Kaha
50 km east of White Island
90 km north-east of Whakatane
270 km east of Auckland
Because 13 and 17 are both indivisible this gives the cicadas an evolutionary advantage as primes are helpful in avoiding other animals with periodic behaviour. Suppose for example that a predator appears every six years in the forest. Then a cicada with an eight or nine-year life cycle will coincide with the predator much more often than a cicada with a seven-year prime life cycle.
Magnitude 5.3
Date-Time Sunday, October 23, 2011 at 03:26:30 UTC
Sunday, October 23, 2011 at 12:26:30 PM at epicenter
Time of Earthquake in other Time Zones
Location 7.693°N, 134.705°E
Depth 58.9 km (36.6 miles)
Region PALAU REGION
Distances 44 km (27 miles) NNE of KOROR, Palau
427 km (265 miles) WSW of Yap, Micronesia
925 km (574 miles) E of Hinatuan, Mindanao, Philippines
1681 km (1044 miles) ESE of MANILA, Philippines
Location Uncertainty horizontal +/- 5.7 km (3.5 miles); depth +/- 12.6 km (7.8 miles)
Parameters NST= 80, Nph= 80, Dmin=>999 km, Rmss=0.8 sec, Gp= 65°,
M-type=body wave magnitude (Mb), Version=2
Source USGS NEIC (WDCS-D)
Event ID us2011sjaj
Magnitude 4.1
Date-Time Sunday, October 23, 2011 at 03:23:09 UTC
Saturday, October 22, 2011 at 10:23:09 PM at epicenter
Time of Earthquake in other Time Zones
Location 17.967°N, 81.442°W
Depth 10 km (6.2 miles)
Region CAYMAN ISLANDS REGION
Distances 147 km (91 miles) S of GEORGE TOWN, Cayman Islands
271 km (168 miles) ENE of Swan Island
376 km (233 miles) W of Montego Bay, Jamaica
874 km (543 miles) S of Miami, Florida
Location Uncertainty horizontal +/- 20.9 km (13.0 miles); depth +/- 3 km (1.9 miles)
Parameters NST= 24, Nph= 25, Dmin=151.4 km, Rmss=0.91 sec, Gp=137°,
M-type=body wave magnitude (Mb), Version=4
Source Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID usb0006bmj