PAGER - M 5.5 - TONGA REGION

Alert level does not include impacts from earthquake-related hazards such as tsunamis, landslides, fires or liquefaction.

Earthquake Shaking Alert Level: GREEN

Download Alert PDFWhat's this?Monday, October 21st, 2013 at 04:01:54 UTC (16:01:54 local)Location: 22.9° S, 174.7° WDepth: 11kmEvent Id: USB000KHRFAlert Version: 3Created: 10 weeks, 0 days after earthquake.
Global Location

Alert Information

Green alert for shaking-related fatalities and economic losses. There is a low likelihood of casualties and damage.
Estimated FatalitiesFatality Alert Level: GREEN
ESTIMATED FATALITY ALERT: GREEN
ESTIMATED FATALITIES (LEVEL)Probability (%)
0 (GREEN)
 
99
1 to 9 (YELLOW)1
10 to 99 (YELLOW)0
100 to 999 (ORANGE)0
1 to 10 thousand (RED)0
10 to 100 thousand (RED)0
100 thousand + (RED)0
Estimated Economic LossesEconomic Alert Level: GREEN
ESTIMATED ECONOMIC ALERT: GREEN
ESTIMATED VALUE IN USD (LEVEL)Probability (%)
0 to 1 million (GREEN)
 
99
1 to 10 million (YELLOW)1
10 to 100 million (YELLOW)0
100 million to 1 billion (ORANGE)0
1 to 10 billion (RED)0
10 to 100 billion (RED)0
100 billion + (RED)0

Detailed Information

Estimated Population Exposed to Earthquake Shaking
Estimated Modified Mercalli IntensityIII-IIIIVVVIVIIVIIIIXX
Est. Population Exposure---*91k*0000000
Perceived ShakingNot FeltWeakLightModerateStrongVery StrongSevereViolentExtreme
Potential Structure DamageResistantnonenonenoneV. LightLightModerateModerate/HeavyHeavyV. Heavy
VulnerablenonenonenoneLightModerateModerate/HeavyHeavyV. HeavyV. Heavy
*Estimated exposure only includes population within calculated shake map area
Population Exposure
Population per ~1 sq. km. from LandScan
Population Exposure Map

Structure Information Summary

Overall, the population in this region resides in structures that are vulnerable to earthquake shaking, though some resistant structures exist.

Historical Earthquakes (with MMI)

Date (UTC)Dist (km)MagMax MMI (#)Shaking Deaths
1980-03-313016.1V (4k)0
1983-03-211686.7VII (53k)0
2006-05-033178VIII (9k)0

Cities Exposedfrom GeoNames Database of Cities with 1,000 or more residents.
MMICityPopulation
IIIVaini3k
IIINuku`alofa22k
IIIHavelu3k
III`Ohonua1k

(k = x1,000)

Historical Events Map
Nearby Events in the EXPO-CAT Earthquake Catalog
#Date/TimeMagLat, Lon, DepthCountryMax MMI (Exposed)DeathsSecondary Effects
ShakingTotal
11974-08-06
18:38 UTC
5.821.82° S, 174.87° W
18km
TOV (45 k)00
21975-09-24
01:47 UTC
6.520.49° S, 173.96° W
28km
TOVII (127)00
31976-05-04
08:30 UTC
5.621.7° S, 174.88° W
3km
TOV (46 k)00
41977-06-22
12:08 UTC
822.91° S, 175.75° W
64km
TOVII (47 k)00tsunami
51978-03-04
04:46 UTC
6.121.86° S, 174.7° W
13km
TOV (48 k)00
61979-07-24
00:53 UTC
6.120.45° S, 174.13° W
18km
TOVI (106)00
71979-10-01
12:23 UTC
5.621.05° S, 175.62° W
15km
TOV (50 k)00
81980-03-31
13:04 UTC
6.120.41° S, 173.68° W
4km
TOV (4 k)00
91980-12-19
02:57 UTC
6.221.21° S, 174.36° W
19km
TOV (52 k)00
101981-11-04
14:38 UTC
6.520.02° S, 174.2° W
36km
TOVII (3 k)00
111983-03-21
07:44 UTC
6.721.53° S, 175.28° W
62km
TOVII (53 k)00
121983-12-23
14:35 UTC
5.521.11° S, 175.46° W
10km
TOVI (26 k)00
131986-08-18
01:59 UTC
6.120.48° S, 174.13° W
26km
TOVII (158)00
141991-03-03
15:20 UTC
6.121.87° S, 175° W
15km
TOV (62 k)00
151991-08-05
06:05 UTC
621.33° S, 174.34° W
31km
TOVI (1 k)00
161995-08-29
08:51 UTC
6.121.14° S, 174.22° W
20km
TOV (69 k)00
171996-08-06
10:13 UTC
5.621.48° S, 175.31° W
37km
TOVI (66 k)00
181999-01-24
07:01 UTC
6.121.14° S, 174.45° W
13km
TOV (74 k)00
191999-02-03
01:13 UTC
6.220.32° S, 174.16° W
9km
TOV (6 k)00
202005-03-19
15:02 UTC
6.120.49° S, 174.19° W
26km
TOVII (317)00
212006-05-03
15:26 UTC
820.15° S, 174.1° W
55km
TOVIII (9 k)00tsunami
222006-05-05
06:16 UTC
5.919.85° S, 174.55° W
35km
TOVII (4 k)00
232006-11-30
11:33 UTC
621.39° S, 174.52° W
13km
TOVI (6 k)00
242007-05-27
18:12 UTC
5.520.07° S, 174.52° W
7km
TOVII (37)00

PAGER content is automatically generated, and only considers losses due to structural damage. Limitations of input data, shaking estimates, and loss models may add uncertainty. PAGER results are generally available within 30 minutes of the earthquake’s occurrence. However, information on the extent of shaking will be uncertain in the minutes and hours following an earthquake and typically improves as additional sensor data and reported intensities are acquired and incorporated into models of the earthquake's source. Users of PAGER estimates should account for uncertainty and always seek the most current PAGER release for any earthquake.