Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.5 on date 21-12-2017 and time 19:50:41 (Italy) in region 3 km E Ussita (MC)

A magnitude ML 2.5 earthquake occured in region: 3 km E Ussita (MC), on

  • 21-12-2017 18:50:41 (UTC)
  • 21-12-2017 19:50:41 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9310, 13.1730 at 8 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Ussita MC 3 444 444
Castelsantangelo sul Nera MC 4 281 725
Visso MC 7 1107 1832
Bolognola MC 8 142 1974
Acquacanina MC 11 121 2095
Fiastra MC 12 559 2654
Preci PG 12 724 3378
Montemonaco AP 13 604 3982
Fiordimonte MC 14 202 4184
Montefortino FM 14 1178 5362
Monte Cavallo MC 16 145 5507
Sarnano MC 16 3264 8771
Amandola FM 16 3629 12400
Pieve Torina MC 16 1458 13858
Pievebovigliana MC 16 866 14724
Montegallo AP 16 523 15247
Norcia PG 17 4957 20204
Muccia MC 20 915 21119
Comunanza AP 20 3166 24285

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
53 Km NW of Teramo (54892 inhabitants)
59 Km NE of Terni (111501 inhabitants)
67 Km E of Perugia (166134 inhabitants)
67 Km N of L'Aquila (69753 inhabitants)
81 Km SW of Ancona (100861 inhabitants)
92 Km NW of Montesilvano (53738 inhabitants)
100 Km NW of Pescara (121014 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 2.5 2017-12-21
18:50:41		 42.9313 13.1727 8 2018-09-04
09:10:40		 Bollettino Sismico Italiano INGV 53138321
Reviewed
Rev100 		ML 2.6 2017-12-21
18:50:41		 42.927 13.1608 9 2017-12-21
18:56:12		 Sala Sismica INGV-Roma 52727291
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-12-21 18:50:41 ± 0.04
Latitude 42.9313 ± 0.0018
Longitude 13.1727 ± 0.0037
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 53138321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 289
Semi-minor axis of confidence ellipse (meter) 143
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 65
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 34
Number of associated phases, regardless of their use for origin computation 63
Number of defining phases 63
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.02338
Epicentral distance of station farthest from the epicenter (degree) 0.83007
Number of stations at which the event was observed 40
Number of stations from which data was used for origin computation 40
Magnitudes information

ML:2.6

Field Value
Value 2.6
Uncertainty 0.2
Num. used stations 74
Type of magnitude ML
Reference to an origin 52727291
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-12-21 18:56:12

ML:2.5

Field Value
Value 2.5
Uncertainty 0.3
Num. used stations 38
Type of magnitude ML
Reference to an origin 53138321
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-01-11 11:07:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2017-12-21T18:51:02.91 0.6 undecidable manual S 344 65.5899 50 0.4 42
IV.CESX.HHZ. 2017-12-21T18:51:01.44 0.6 undecidable manual S 233 59.6958 50 0.51 42
IV.MOMA.HHZ. 2017-12-21T18:50:59.16 0.3 undecidable manual S 254 51.0156 50 0.54 63
IV.FOSV.EHZ. 2017-12-21T18:50:59.50 0.3 undecidable manual S 321 52.3032 50 0.54 63
IV.TERO.HHZ. 2017-12-21T18:50:58.28 0.6 undecidable manual S 134 49.0176 50 0.19 46
IV.FSSB.HHZ. 2017-12-21T18:50:58.01 0.1 undecidable manual P 339 90.3429 50 0.38 81
IV.ATCC.EHZ. 2017-12-21T18:50:58.98 0.6 undecidable manual S 303 51.5151 50 0.22 45
IV.CAMP.HHZ. 2017-12-21T18:50:58.07 0.3 undecidable manual S 156 47.9187 50 0.28 67
IV.CING.HHZ. 2017-12-21T18:50:58.66 0.6 undecidable manual S 2 49.3173 50 0.49 43
IV.RM33.EHZ. 2017-12-21T18:50:57.92 0.3 undecidable manual S 176 47.0196 50 0.38 66
IV.T0110.HHZ. 2017-12-21T18:50:57.84 0.3 undecidable manual P 147 92.1411 50 -0.07 64
IV.MGAB.HHZ. 2017-12-21T18:50:57.31 0.6 undecidable manual P 269 86.1471 50 0.32 41
IV.FAGN.HHZ. 2017-12-21T18:50:56.52 0.3 undecidable manual P 155 81.1521 50 0.31 63
IV.ATPI.EHZ. 2017-12-21T18:50:56.74 0.1 undecidable manual P 313 84.8484 50 -0.05 88
IV.LNSS.HHZ. 2017-12-21T18:50:55.09 0.6 undecidable manual S 197 38.0286 50 -0.05 48
IV.ATVO.HHZ. 2017-12-21T18:50:55.89 0.1 undecidable manual P 309 79.6647 50 -0.09 88
IV.SNTG.HHZ. 2017-12-21T18:50:55.96 0.6 undecidable manual S 332 40.5261 50 0.14 47
IV.T1299.EHZ. 2017-12-21T18:50:54.32 0.6 undecidable manual S 165 34.1436 50 0.2 47
IV.FRON.EHZ. 2017-12-21T18:50:54.94 0.1 undecidable manual P 331 74.37 50 -0.24 86
IV.FIAM.HNN. 2017-12-21T18:50:54.75 0.3 undecidable manual P 184 73.7706 50 -0.32 63
IV.ATFO.HHZ. 2017-12-21T18:50:54.19 0.3 undecidable manual P 315 68.5758 50 -0.09 67
IV.ARVD.HHZ. 2017-12-21T18:50:53.63 0.3 undecidable manual P 344 65.5899 50 -0.19 66
IV.ATSC.EHE. 2017-12-21T18:50:53.81 0.3 undecidable manual P 324 67.377 50 -0.28 65
IV.MURB.HHZ. 2017-12-21T18:50:53.54 0.1 undecidable manual P 305 64.0914 50 -0.05 91
IV.SEF1.HNZ. 2017-12-21T18:50:53.04 0.6 undecidable manual S 323 30.0477 106 0.26 46
IV.MDAR.HNZ. 2017-12-21T18:50:52.42 0.6 undecidable manual S 355 29.0487 106 -0.03 49
IV.CESX.HHZ. 2017-12-21T18:50:52.74 0.1 undecidable manual P 233 59.6958 50 -0.16 90
IV.T1221.HNZ. 2017-12-21T18:50:52.24 0.3 undecidable manual S 254 27.6501 107 0.29 69
IV.MMUR.HNE. 2017-12-21T18:50:52.50 0.3 undecidable manual P 346 58.3971 50 -0.21 67
IV.MOMA.HHZ. 2017-12-21T18:50:51.62 0.1 undecidable manual P 254 51.0156 50 0.05 93
IV.CING.HHZ. 2017-12-21T18:50:51.02 0.1 undecidable manual P 2 49.3173 50 -0.29 89
IV.ARRO.EHZ. 2017-12-21T18:50:51.71 0.3 undecidable manual P 220 51.2154 50 0.1 69
IV.ATCC.EHZ. 2017-12-21T18:50:51.51 0.1 undecidable manual P 303 51.5151 50 -0.15 91
IV.TERO.HHZ. 2017-12-21T18:50:51.00 0.1 undecidable manual P 134 49.0176 50 -0.27 90
IV.FOSV.EHZ. 2017-12-21T18:50:51.46 0.1 undecidable manual P 321 52.3032 50 -0.31 88
IV.CAMP.HHZ. 2017-12-21T18:50:50.80 0.1 negative manual P 156 47.9187 50 -0.3 89
IV.EL6.EHZ. 2017-12-21T18:50:50.24 0.1 undecidable manual P 353 44.5221 50 -0.33 89
IV.CESI.HHZ. 2017-12-21T18:50:50.54 0.6 undecidable manual S 291 23.2545 110 0.02 49
IV.PF6.EHZ. 2017-12-21T18:50:50.43 0.3 undecidable manual S 4 22.9548 110 0 74
IV.RM33.EHZ. 2017-12-21T18:50:50.69 0.1 undecidable manual P 176 47.0196 50 -0.26 90
IV.SNTG.HHZ. 2017-12-21T18:50:49.63 0.3 undecidable manual P 332 40.5261 50 -0.32 67
IV.LNSS.HHZ. 2017-12-21T18:50:49.31 0.3 undecidable manual P 197 38.0286 50 -0.25 69
IV.GUMA.HHZ. 2017-12-21T18:50:49.89 0.6 undecidable manual S 42 19.6692 113 0.53 44
IV.SEF1.HNZ. 2017-12-21T18:50:48.02 0.6 undecidable manual P 323 30.0477 106 -0.18 47
IV.T1299.EHZ. 2017-12-21T18:50:48.90 0.1 undecidable manual P 165 34.1436 50 -0.08 96
IV.SMA1.EHZ. 2017-12-21T18:50:48.95 0.1 negative manual P 158 35.9418 50 -0.29 91
IV.NRCA.HNZ. 2017-12-21T18:50:47.23 0.6 undecidable manual S 204 11.877 125 0.25 48
IV.MDAR.HNZ. 2017-12-21T18:50:47.80 0.3 undecidable manual P 355 29.0487 106 -0.21 70
IV.FDMO.HHZ. 2017-12-21T18:50:47.67 0.3 undecidable manual S 329 13.5753 122 0.19 73
IV.MMO1.EHZ. 2017-12-21T18:50:47.67 0.3 undecidable manual S 106 12.9759 123 0.36 70
IV.T1221.HNZ. 2017-12-21T18:50:47.70 0.1 positive manual P 254 27.6501 107 -0.02 98
IV.MF5.EHZ. 2017-12-21T18:50:47.53 0.3 undecidable manual P 75 24.1536 109 0.47 67
IV.GUMA.HHZ. 2017-12-21T18:50:46.67 0.1 negative manual P 42 19.6692 113 0.45 91
IV.FEMA.HNZ. 2017-12-21T18:50:46.73 0.6 undecidable manual S 289 10.5783 128 0.11 50
IV.CESI.HHZ. 2017-12-21T18:50:46.76 0.3 undecidable manual P 291 23.2545 110 -0.14 72
IV.PF6.EHZ. 2017-12-21T18:50:46.66 0.1 negative manual P 4 22.9548 110 -0.19 95
IV.MMO1.EHZ. 2017-12-21T18:50:45.26 0.1 negative manual P 106 12.9759 123 0.21 97
IV.CSP1.EHZ. 2017-12-21T18:50:45.92 0.1 negative manual P 8 17.9709 115 0 100
IV.FDMO.HHZ. 2017-12-21T18:50:45.03 0.1 negative manual P 329 13.5753 122 -0.11 99
IV.MC2.EHZ. 2017-12-21T18:50:44.46 0.3 undecidable manual S 149 2.5974 163 -0.52 69
IV.NRCA.HNZ. 2017-12-21T18:50:44.97 0.1 negative manual P 204 11.877 125 0.12 99
IV.FEMA.HNZ. 2017-12-21T18:50:44.70 0.1 positive manual P 289 10.5783 128 0.06 100
IV.MC2.EHZ. 2017-12-21T18:50:43.50 0.1 negative manual P 149 2.5974 163 -0.2 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARVD.HHE. ML:2.3 0.00036899999999999997 0.7 AML other m 2017-12-21T18:51:04.35
IV.NRCA.HHN. ML:2.9 0.010105000000000001 0.44 AML other m 2017-12-21T18:50:47.75
IV.NRCA.HNN. ML:2.9 0.009615 0.46 AML other m 2017-12-21T18:50:47.76
IV.FEMA.HNN. ML:3.0 0.013699999999999999 0.88 AML other m 2017-12-21T18:50:47.66
IV.NRCA.HNE. ML:3.1 0.015 0.22 AML other m 2017-12-21T18:50:47.57
IV.NRCA.HHE. ML:3.1 0.0154 0.22 AML other m 2017-12-21T18:50:47.58
IV.FDMO.HHE. ML:2.8 0.00787 0.54 AML other m 2017-12-21T18:50:48.36
IV.FDMO.HHN. ML:2.7 0.00587 0.94 AML other m 2017-12-21T18:50:48.21
IV.CESI.HHN. ML:2.7 0.003315 0.44 AML other m 2017-12-21T18:50:51.14
IV.T1299.EHN. ML:2.4 0.001135 1.54 AML other m 2017-12-21T18:50:55.08
IV.T1299.HNN. ML:2.4 0.001125 1.56 AML other m 2017-12-21T18:50:55.07
IV.GUMA.HNN. ML:3.0 0.00747 0.5 AML other m 2017-12-21T18:50:56.51
IV.LNSS.HHN. ML:2.4 0.00128 0.62 AML other m 2017-12-21T18:50:57.20
IV.RM33.HNN. ML:2.3 0.0006355 0.42 AML other m 2017-12-21T18:50:59.37
IV.RM33.EHN. ML:2.3 0.0006154999999999999 0.42 AML other m 2017-12-21T18:50:59.37
IV.SNTG.HNE. ML:2.3 0.0009025000000000001 0.52 AML other m 2017-12-21T18:50:59.77
IV.SNTG.HHE. ML:2.2 0.000896 0.52 AML other m 2017-12-21T18:50:59.78
IV.MOMA.HHE. ML:2.6 0.0011285000000000002 1.32 AML other m 2017-12-21T18:51:00.27
IV.MOMA.HHN. ML:2.5 0.0008950000000000001 0.32 AML other m 2017-12-21T18:51:00.53
IV.TERO.HHN. ML:2.4 0.0006684999999999999 0.3 AML other m 2017-12-21T18:51:01.33
IV.FOSV.EHN. ML:2.6 0.0010125 0.4 AML other m 2017-12-21T18:51:01.04
IV.TERO.HHE. ML:2.3 0.0005905 0.7 AML other m 2017-12-21T18:51:01.76
IV.FOSV.EHE. ML:2.5 0.0008345000000000001 1.44 AML other m 2017-12-21T18:51:01.26
IV.CING.HHN. ML:2.0 0.0003305 0.68 AML other m 2017-12-21T18:51:02.79
IV.CING.HHE. ML:2.1 0.000443 1.36 AML other m 2017-12-21T18:51:03.76
IV.CESX.HHN. ML:2.4 0.000731 1.58 AML other m 2017-12-21T18:51:05.19
IV.CESX.HHE. ML:2.2 0.0005420000000000001 0.46 AML other m 2017-12-21T18:51:06.47
IV.GUMA.HHN. ML:2.8 0.005460821 0.32 AML other m 2017-12-21T18:50:50.59
IV.GUMA.HNE. ML:2.8 0.0044498195 0.768 AML other m 2017-12-21T18:50:51.50
IV.CESI.HHE. ML:2.4 0.0018939979999999998 0.7424 AML other m 2017-12-21T18:50:51.37
IV.LNSS.HHE. ML:2.2 0.0005559935 1.7408 AML other m 2017-12-21T18:50:56.20
IV.CAMP.HHN. ML:2.1 0.0003844069 0.7424 AML other m 2017-12-21T18:50:59.53
IV.CAMP.HHE. ML:2.1 0.00034640119999999994 1.5616 AML other m 2017-12-21T18:50:59.31
IV.ATCC.EHE. ML:2.5 0.0008497155000000001 0.3456 AML other m 2017-12-21T18:51:00.01
IV.ATCC.EHN. ML:2.3 0.0005819452 0.32 AML other m 2017-12-21T18:50:59.73
IV.MOMA.HNE. ML:2.6 0.0010935338500000001 0.2432 AML other m 2017-12-21T18:51:00.28
IV.ARVD.HHN. ML:1.9 0.0001452682 0.6784 AML other m 2017-12-21T18:51:04.24
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in miniseed + resp format Download