Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 18-12-2021 and time 21:30:09 (Italy) in region 3 km NW Colle di Tora (RI)

A magnitude ML 1.6 earthquake occured in region: 3 km NW Colle di Tora (RI), on

  • 18-12-2021 20:30:09 (UTC)
  • 18-12-2021 21:30:09 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.2290, 12.9140 at 11 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
Colle di Tora RI 3 372 372
Poggio Moiano RI 4 2751 3123
Monteleone Sabino RI 4 1224 4347
Castel di Tora RI 5 288 4635
Torricella in Sabina RI 5 1342 5977
Rocca Sinibalda RI 5 815 6792
Poggio San Lorenzo RI 6 589 7381
Longone Sabino RI 7 597 7978
Ascrea RI 8 234 8212
Paganico Sabino RI 8 172 8384
Pozzaglia Sabina RI 9 360 8744
Frasso Sabino RI 9 743 9487
Varco Sabino RI 9 187 9674
Scandriglia RI 9 3108 12782
Casaprota RI 9 744 13526
Poggio Nativo RI 10 2622 16148
Belmonte in Sabina RI 10 636 16784
Montenero Sabino RI 10 299 17083
Orvinio RI 11 405 17488
Marcetelli RI 11 89 17577
Collegiove RI 12 213 17790
Concerviano RI 12 291 18081
Nerola RM 13 1926 20007
Turania RI 13 241 20248
Toffia RI 13 1058 21306
Montorio Romano RM 13 1984 23290
Mompeo RI 14 530 23820
Castelnuovo di Farfa RI 14 1059 24879
Salisano RI 14 567 25446
Monteflavio RM 15 1348 26794
Petrella Salto RI 15 1197 27991
Percile RM 15 255 28246
Collalto Sabino RI 15 442 28688
Nespolo RI 15 246 28934
Fara in Sabina RI 15 13742 42676
Monte San Giovanni in Sabina RI 16 714 43390
Vivaro Romano RM 16 182 43572
Moricone RM 17 2650 46222
Licenza RM 17 1011 47233
Vallinfreda RM 17 283 47516
Montelibretti RM 18 5323 52839
Cittaducale RI 18 6828 59667
Fiamignano RI 18 1413 61080
Montopoli di Sabina RI 18 4210 65290
Poggio Mirteto RI 19 6315 71605
Pescorocchiano RI 20 2075 73680
Poggio Catino RI 20 1341 75021
Roccagiovine RM 20 263 75284
Riofreddo RM 20 781 76065

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km NE of Guidonia Montecelio (88673 inhabitants)
31 Km NE of Tivoli (56533 inhabitants)
42 Km W of L'Aquila (69753 inhabitants)
43 Km SE of Terni (111501 inhabitants)
51 Km NE of Roma (2864731 inhabitants)
61 Km N of Velletri (53303 inhabitants)
70 Km E of Viterbo (67173 inhabitants)
71 Km NE of Pomezia (62966 inhabitants)
74 Km NE of Aprilia (73446 inhabitants)
75 Km NE of Fiumicino (78395 inhabitants)
81 Km SW of Teramo (54892 inhabitants)
83 Km S of Foligno (57155 inhabitants)
85 Km N of Latina (125985 inhabitants)
90 Km N of Anzio (54211 inhabitants)
94 Km E of Civitavecchia (52991 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 1.6 2021-12-18
20:30:09		 42.2292 12.9135 11 2022-03-30
13:04:26		 Bollettino Sismico Italiano INGV 99311891
Reviewed
Rev100 		ML 1.6 2021-12-18
20:30:09		 42.2167 12.9215 16 2021-12-18
20:40:48		 Sala Sismica INGV-Roma 98695921
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-18 20:30:09 ± 0.04
Latitude 42.2292 ± 0.0027
Longitude 12.9135 ± 0.0036
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99311891

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 290
Semi-minor axis of confidence ellipse (meter) 236
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 342
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) 60
Number of associated phases, regardless of their use for origin computation 54
Number of defining phases 39
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.95868
Number of stations at which the event was observed 39
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 99311891
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-04 08:50:15

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 98695921
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-18 20:40:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.STAL.HHZ. 2021-12-18T20:32:00.14 3.0 undecidable manual Sn 1.5 0
IV.MBAL.EHZ. 2021-12-18T20:31:50.71 3.0 undecidable manual Sn -1.59 0
IV.HAGA.HHZ. 2021-12-18T20:31:44.22 3.0 undecidable manual Pg 16.48 0
IV.FERC.HHZ.00 2021-12-18T20:31:31.13 3.0 undecidable manual Pg 13.43 0
IV.BAG8.EHZ. 2021-12-18T20:31:26.33 3.0 undecidable manual Pg 15.81 0
IV.MBAL.EHZ. 2021-12-18T20:31:16.74 3.0 negative manual Pg 9.4 0
CR.STON.BHZ. 2021-12-18T20:31:14.56 3.0 negative manual Pg 9.51 0
IV.GRIS.EHZ. 2021-12-18T20:31:13.15 3.0 undecidable manual Pg 11.46 0
CR.ZAG.BHZ. 2021-12-18T20:31:13.36 3.0 undecidable manual Pn -0.2 0
GU.GENL.EHZ. 2021-12-18T20:31:11.45 3.0 negative manual Pn 6.28 0
OT.OT17.EHZ. 2021-12-18T20:31:06.50 3.0 undecidable manual Sn -0.73 0
IV.GATE.HHZ. 2021-12-18T20:31:02.90 3.0 undecidable manual Sg 1.88 0
IV.MNTV.EHZ. 2021-12-18T20:30:59.75 3.0 negative manual Pn -1.14 0
IV.CDRU.HHZ. 2021-12-18T20:30:51.24 3.0 undecidable manual Pn 1.02 0
IV.CELB.HHZ. 2021-12-18T20:30:50.68 3.0 negative manual Pg 6.62 0
IV.CSP1.EHZ. 2021-12-18T20:30:39.05 0.3 undecidable manual S 14 98.6235 50 0.34 62
IV.ASSB.HHZ. 2021-12-18T20:30:37.49 0.3 undecidable manual S 347 92.6406 50 0.39 63
IV.FDMO.HHZ. 2021-12-18T20:30:36.85 0.3 undecidable manual S 9 90.6426 50 0.26 65
IV.BARO.HNZ. 2021-12-18T20:30:31.75 0.3 undecidable manual S 272 70.8735 50 0.45 65
IV.LPEL.HHZ. 2021-12-18T20:30:27.48 0.6 undecidable manual P 101 106.4157 50 -0.27 41
IV.CSP1.EHZ. 2021-12-18T20:30:26.66 0.3 undecidable manual P 14 98.6235 50 0.11 65
IV.CESX.HHZ. 2021-12-18T20:30:25.65 0.6 undecidable manual S 328 49.9167 50 -0.05 47
IV.ASSB.HHZ. 2021-12-18T20:30:25.95 0.1 undecidable manual P 347 92.6406 50 0.33 84
IV.FDMO.HHZ. 2021-12-18T20:30:25.55 1.0 negative manual P 9 90.6426 50 0.22 22
IV.CESI.HHZ. 2021-12-18T20:30:24.55 0.3 undecidable manual P 360 86.0472 50 -0.06 66
IV.RCAV.EHZ. 2021-12-18T20:30:23.52 0.3 undecidable manual S 176 42.4242 50 -0.19 72
IV.ARRO.EHZ. 2021-12-18T20:30:23.04 0.3 undecidable manual S 343 40.626 50 -0.2 69
IV.RM33.EHZ. 2021-12-18T20:30:22.64 0.3 undecidable manual S 38 39.627 50 -0.33 68
IV.T0110.HHZ. 2021-12-18T20:30:22.36 0.3 undecidable manual P 90 70.8735 50 0.09 68
IV.BARO.HNZ. 2021-12-18T20:30:22.54 0.6 undecidable manual P 272 70.8735 50 0.27 44
IV.SRES.HHZ. 2021-12-18T20:30:21.22 0.6 undecidable manual S 272 33.1446 50 -0.02 48
IV.NRCA.HHZ. 2021-12-18T20:30:21.69 0.6 undecidable manual P 14 68.9754 50 -0.3 43
IV.GIGS.HHN. 2021-12-18T20:30:20.85 0.1 undecidable manual P 65 59.496 50 0.33 88
IV.CERT.HHZ. 2021-12-18T20:30:20.62 0.3 undecidable manual S 170 31.5462 50 -0.2 73
IV.SMA1.EHZ. 2021-12-18T20:30:20.01 0.3 undecidable manual P 38 56.2992 50 -0.03 71
IV.CESX.HHZ. 2021-12-18T20:30:19.20 0.1 undecidable manual P 328 49.9167 50 0.17 95
IV.FAGN.HHZ. 2021-12-18T20:30:19.80 0.3 undecidable manual P 86 55.2003 50 -0.06 71
IV.MTCE.HHZ. 2021-12-18T20:30:19.47 0.6 undecidable manual S 212 26.8509 50 -0.09 49
IV.CAMP.HHE. 2021-12-18T20:30:19.77 0.3 undecidable manual P 50 53.0025 50 0.26 68
IV.GAVE.HNZ. 2021-12-18T20:30:18.97 0.1 undecidable manual P 358 51.4152 50 -0.3 89
IV.PTQR.HHZ. 2021-12-18T20:30:18.38 0.3 undecidable manual P 120 46.2204 50 -0.09 72
IV.ARRO.EHZ. 2021-12-18T20:30:17.46 0.1 undecidable manual P 343 40.626 50 -0.16 94
IV.LNSS.HHZ. 2021-12-18T20:30:17.63 0.3 undecidable manual P 14 42.7239 50 -0.3 68
IT.CSO1.HGZ. 2021-12-18T20:30:17.92 0.6 undecidable manual S 135 20.1687 50 0.14 48
IV.FIAM.HHZ. 2021-12-18T20:30:17.05 0.3 undecidable manual S 75 17.2716 50 0.05 75
IV.RM33.EHZ. 2021-12-18T20:30:17.07 0.3 undecidable manual P 38 39.627 50 -0.39 68
IV.RCAV.EHZ. 2021-12-18T20:30:17.54 0.3 undecidable manual P 176 42.4242 50 -0.35 69
IT.MMP1.HGZ. 2021-12-18T20:30:16.12 0.3 undecidable manual S 279 13.7751 129 0.06 76
IV.SRES.HHZ. 2021-12-18T20:30:16.49 0.3 undecidable manual P 272 33.1446 50 0.03 74
IV.CERT.HHZ. 2021-12-18T20:30:15.93 0.3 undecidable manual P 170 31.5462 50 -0.29 71
IV.MTCE.HHZ. 2021-12-18T20:30:15.47 0.1 positive manual P 212 26.8509 50 -0.02 100
IT.CSO1.HGZ. 2021-12-18T20:30:14.63 0.1 undecidable manual P 135 20.1687 50 0.17 97
IV.FIAM.HHZ. 2021-12-18T20:30:14.11 0.1 undecidable manual P 75 17.2716 50 0.1 100
IT.MMP1.HGZ. 2021-12-18T20:30:13.74 0.3 undecidable manual P 279 13.7751 129 0.28 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FIAM.HHN. ML:1.3 0.00016999999999999999 1.88 AML other m 2021-12-18T20:30:17.99
IV.FIAM.HHE. ML:1.3 0.0001545 0.5 AML other m 2021-12-18T20:30:18.55
IV.MTCE.HHE. ML:1.3 0.00011394999999999999 0.5 AML other m 2021-12-18T20:30:19.64
IV.MTCE.HHN. ML:1.2 0.00007725 0.66 AML other m 2021-12-18T20:30:20.41
IV.CERT.HHE. ML:1.3 0.00009554999999999999 1.64 AML other m 2021-12-18T20:30:20.92
IV.CERT.HHN. ML:1.6 0.00016949999999999997 0.6 AML other m 2021-12-18T20:30:21.21
IV.SRES.HHE. ML:1.3 0.00007895000000000001 0.86 AML other m 2021-12-18T20:30:22.55
IV.RM33.EHE. ML:1.7 0.00017999999999999998 0.16 AML other m 2021-12-18T20:30:23.66
IV.RM33.EHN. ML:1.5 0.00010435 0.34 AML other m 2021-12-18T20:30:23.92
IV.RCAV.EHE. ML:1.4 0.00009025 0.12 AML other m 2021-12-18T20:30:24.02
IV.RCAV.EHN. ML:1.7 0.000161 1.12 AML other m 2021-12-18T20:30:24.66
IV.SRES.HHN. ML:1.3 0.00008575 0.42 AML other m 2021-12-18T20:30:24.40
IV.LNSS.HHE. ML:1.8 0.00020050000000000002 0.32 AML other m 2021-12-18T20:30:24.72
IV.LNSS.HHN. ML:1.8 0.00018449999999999999 1.44 AML other m 2021-12-18T20:30:25.26
IV.SMA1.EHN. ML:2.0 0.000212 0.44 AML other m 2021-12-18T20:30:32.64
IV.SMA1.EHE. ML:1.8 0.0001525 0.6 AML other m 2021-12-18T20:30:32.21
IV.NRCA.HHN. ML:1.8 0.00010295 0.12 AML other m 2021-12-18T20:30:32.68
IV.NRCA.HHE. ML:2.0 0.0001705 1.14 AML other m 2021-12-18T20:30:32.70
IV.FAGN.HHE. ML:1.8 0.00014700000000000002 0.52 AML other m 2021-12-18T20:30:32.44
IV.FAGN.HHN. ML:1.7 0.0001178 0.98 AML other m 2021-12-18T20:30:33.54
IV.CESI.HHN. ML:2.0 0.00010829999999999999 0.84 AML other m 2021-12-18T20:30:39.50
IV.FDMO.HHN. ML:1.8 0.00006385 1.12 AML other m 2021-12-18T20:30:39.33
IV.FDMO.HHE. ML:1.6 0.0000511 0.84 AML other m 2021-12-18T20:30:39.57
IV.CESI.HHE. ML:1.7 0.0000654 0.56 AML other m 2021-12-18T20:30:40.61
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