Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 21-12-2020 and time 10:57:27 (UTC) in region 2 km SE Vicovaro (RM)

A magnitude ML 1.6 earthquake occured in region: 2 km SE Vicovaro (RM), on

  • 21-12-2020 10:57:27 (UTC)
  • 21-12-2020 11:57:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.0010, 12.9110 at 9 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
Vicovaro RM 2 4019 4019
Sambuci RM 3 925 4944
Saracinesco RM 4 185 5129
Mandela RM 4 917 6046
Castel Madama RM 4 7399 13445
Ciciliano RM 5 1336 14781
Roccagiovine RM 6 263 15044
San Polo dei Cavalieri RM 6 2992 18036
Anticoli Corrado RM 7 915 18951
Cineto Romano RM 7 601 19552
Roviano RM 8 1351 20903
Licenza RM 8 1011 21914
Cerreto Laziale RM 9 1118 23032
Marcellina RM 9 7280 30312
Marano Equo RM 9 779 31091
San Gregorio da Sassola RM 10 1619 32710
Arsoli RM 10 1586 34296
Tivoli RM 10 56533 90829
Gerano RM 10 1263 92092
Riofreddo RM 10 781 92873
Agosta RM 10 1765 94638
Percile RM 11 255 94893
Casape RM 11 744 95637
Rocca Canterano RM 11 196 95833
Pisoniano RM 11 770 96603
Vallinfreda RM 12 283 96886
Oricola AQ 12 1244 98130
Canterano RM 12 351 98481
Poli RM 13 2418 100899
Cervara di Roma RM 13 455 101354
Rocca di Botte AQ 13 856 102210
Vivaro Romano RM 14 182 102392
Rocca Santo Stefano RM 14 975 103367
Monteflavio RM 14 1348 104715
Palombara Sabina RM 14 13269 117984
San Vito Romano RM 14 3273 121257
Orvinio RI 15 405 121662
Guidonia Montecelio RM 15 88673 210335
Capranica Prenestina RM 16 351 210686
Gallicano nel Lazio RM 16 6334 217020
Camerata Nuova RM 17 447 217467
Bellegra RM 17 2887 220354
Sant'Angelo Romano RM 17 5018 225372
Pereto AQ 17 682 226054
Moricone RM 17 2650 228704
Castel San Pietro Romano RM 17 902 229606
Turania RI 17 241 229847
Rocca di Cave RM 17 377 230224
Montorio Romano RM 18 1984 232208
Subiaco RM 18 9074 241282
Carsoli AQ 18 5396 246678
Palestrina RM 18 21672 268350
Pozzaglia Sabina RI 18 360 268710
Olevano Romano RM 19 6687 275397
Zagarolo RM 19 17843 293240
Roiate RM 19 737 293977
Collalto Sabino RI 19 442 294419
Scandriglia RI 19 3108 297527
Genazzano RM 19 6036 303563

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km E of Tivoli (56533 inhabitants)
15 Km E of Guidonia Montecelio (88673 inhabitants)
37 Km NE of Velletri (53303 inhabitants)
37 Km E of Roma (2864731 inhabitants)
50 Km NE of Pomezia (62966 inhabitants)
50 Km NE of Aprilia (73446 inhabitants)
56 Km SW of L'Aquila (69753 inhabitants)
59 Km N of Latina (125985 inhabitants)
61 Km E of Fiumicino (78395 inhabitants)
66 Km NE of Anzio (54211 inhabitants)
66 Km SE of Terni (111501 inhabitants)
81 Km SE of Viterbo (67173 inhabitants)
93 Km E of Civitavecchia (52991 inhabitants)
98 Km SW of Teramo (54892 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 2020-12-21
10:57:27		 42.0012 12.9108 9 2021-02-26
14:56:14		 Bollettino Sismico Italiano INGV 86124401
Reviewed
Rev100 		ML 1.6 2020-12-21
10:57:27		 42.0002 12.9022 11 2020-12-21
11:15:15		 Sala Sismica INGV-Roma 85598591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-21 10:57:27 ± 0.07
Latitude 42.0012 ± 0.0036
Longitude 12.9108 ± 0.0048
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86124401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 379
Semi-minor axis of confidence ellipse (meter) 277
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 193
Circular confidence region, given by single value of horizontal uncertainty (meter) 380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 53
Number of associated phases, regardless of their use for origin computation 41
Number of defining phases 29
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.84087
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 16
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 15
Type of magnitude ML
Reference to an origin 86124401
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-09 16:17:01

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 15
Type of magnitude ML
Reference to an origin 85598591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-21 11:15:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ORI.HHZ. 2020-12-21T10:59:10.37 3.0 undecidable manual Sg 10.25 0
MN.PDG.HHZ. 2020-12-21T10:58:56.42 3.0 negative manual Pg 17.780001 0
IV.ECTS.HHZ. 2020-12-21T10:58:49.97 3.0 undecidable manual Pg 14.65 0
IV.HAGA.HHZ. 2020-12-21T10:58:49.90 3.0 undecidable manual Pg 6.78 0
NI.VINO.HHZ. 2020-12-21T10:58:39.52 3.0 positive manual Pg 7.72 0
XK.GIZZ.HHZ. 2020-12-21T10:58:36.40 3.0 undecidable manual Pg 8.39 0
CR.STON.BHZ. 2020-12-21T10:58:33.14 3.0 undecidable manual Pg 9.51 0
OT.TAR1.HHZ. 2020-12-21T10:58:32.75 3.0 undecidable manual Pg 9.31 0
IV.CDRU.HHZ. 2020-12-21T10:58:32.17 3.0 undecidable manual Sn -4.6 0
IV.LEVAN.EHZ. 2020-12-21T10:58:30.42 3.0 undecidable manual Pn 0.76 0
IV.CADC.HNZ. 2020-12-21T10:58:26.76 3.0 positive manual Pn -1.65 0
IT.MCLF.HNZ. 2020-12-21T10:58:14.32 3.0 undecidable manual S 0.44 0
IV.GAVE.EHZ. 2020-12-21T10:57:51.24 0.6 undecidable manual S 359 76.6677 50 0.63 39
IV.VVLD.HHZ. 2020-12-21T10:57:46.41 0.1 undecidable manual S 104 60.5949 50 0.1 93
IV.LATB.EHZ. 2020-12-21T10:57:45.39 0.6 undecidable manual S 176 56.3991 50 0.19 46
IV.GIUL.HHZ. 2020-12-21T10:57:45.13 0.6 undecidable manual S 150 56.7987 50 -0.17 46
IV.MOMA.HHZ. 2020-12-21T10:57:43.18 0.3 undecidable manual P 343 93.3399 50 -0.14 65
IV.PTQR.HHZ. 2020-12-21T10:57:41.22 0.3 undecidable manual S 87 40.4262 50 0.28 70
IV.SRES.HHZ. 2020-12-21T10:57:41.87 0.6 undecidable manual S 309 42.1245 50 0.49 44
IV.GUAR.HNN. 2020-12-21T10:57:40.67 0.6 undecidable manual S 125 40.3263 50 -0.23 47
IV.GAVE.EHZ. 2020-12-21T10:57:40.29 0.3 undecidable manual P 359 76.6677 50 -0.47 63
IV.SAMA.EHZ. 2020-12-21T10:57:39.66 1.0 undecidable manual S 227 35.9418 50 -0.07 25
IV.FIAM.HHZ. 2020-12-21T10:57:39.12 0.6 undecidable manual S 30 34.1436 50 -0.13 49
IV.RDP.HHZ. 2020-12-21T10:57:38.99 0.6 undecidable manual S 212 31.4463 50 0.46 46
IV.GIUL.HHZ. 2020-12-21T10:57:37.27 0.6 undecidable manual P 150 56.7987 50 -0.42 44
IV.VVLD.HHZ. 2020-12-21T10:57:37.88 0.3 undecidable manual P 104 60.5949 50 -0.4 66
IV.LATB.EHZ. 2020-12-21T10:57:37.77 0.3 undecidable manual P 176 56.3991 50 0.14 70
IV.PTQR.HHZ. 2020-12-21T10:57:35.03 0.3 undecidable manual P 87 40.4262 50 -0.14 72
IV.SRES.HHZ. 2020-12-21T10:57:35.06 0.6 undecidable manual P 309 42.1245 50 -0.37 46
IT.CSO1.HGE. 2020-12-21T10:57:34.55 0.1 undecidable manual S 53 18.2706 117 0.13 100
IV.SAMA.EHZ. 2020-12-21T10:57:34.98 0.6 undecidable manual P 227 35.9418 50 0.5 45
IV.GUAR.HNN. 2020-12-21T10:57:34.98 0.3 undecidable manual P 125 40.3263 50 -0.17 72
IV.RCAV.EHE. 2020-12-21T10:57:34.01 0.3 undecidable manual S 171 17.2716 118 -0.1 76
IV.RMP.HHN. 2020-12-21T10:57:33.00 1.0 undecidable manual P 219 27.0507 109 -0.02 25
IV.RDP.HHZ. 2020-12-21T10:57:33.68 1.0 undecidable manual P 212 31.4463 50 -0.1 25
IT.MMP1.HGE. 2020-12-21T10:57:33.67 1.0 undecidable manual P 334 30.5472 50 0.02 25
IV.FIAM.HHZ. 2020-12-21T10:57:33.78 0.3 undecidable manual P 30 34.1436 50 -0.42 69
IV.MTCE.HHZ. 2020-12-21T10:57:32.89 0.3 undecidable manual S 280 14.0748 123 -0.27 73
IV.RCAV.EHE. 2020-12-21T10:57:31.45 0.3 undecidable manual P 171 17.2716 118 0.22 74
IT.CSO1.HGE. 2020-12-21T10:57:31.81 0.1 undecidable manual P 53 18.2706 117 0.4 94
IV.MTCE.HHZ. 2020-12-21T10:57:30.70 0.3 undecidable manual P 280 14.0748 123 0.02 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTCE.HHN. ML:1.6 0.0003772893 0.32 AML other m 2020-12-21T10:57:33.10
IV.MTCE.HHE. ML:1.9 0.00081712905 0.2752 AML other m 2020-12-21T10:57:34.43
IV.FIAM.HHN. ML:1.4 0.00009714397999999999 0.4032 AML other m 2020-12-21T10:57:40.33
IV.PTQR.HHN. ML:1.8 0.00020543164999999998 0.32 AML other m 2020-12-21T10:57:41.50
IV.PTQR.HHE. ML:1.8 0.00024029525000000002 0.2176 AML other m 2020-12-21T10:57:41.53
IV.FIAM.HHE. ML:1.3 0.00008152459500000001 1.52 AML other m 2020-12-21T10:57:42.80
IV.SRES.HHN. ML:1.3 0.000069204305 0.3008 AML other m 2020-12-21T10:57:44.21
IV.SRES.HHE. ML:1.2 0.000056184235 0.416 AML other m 2020-12-21T10:57:44.64
IV.FIAM.HNN. ML:1.7 0.00021141909999999997 0.6208 AML other m 2020-12-21T10:57:44.46
IV.VVLD.HHE. ML:1.4 0.00005189469 0.1408 AML other m 2020-12-21T10:57:47.32
IV.GAVE.EHN. ML:1.7 0.00007344262500000002 1.8208 AML other m 2020-12-21T10:57:53.93
IV.GAVE.EHE. ML:1.7 0.00007947314999999999 0.1792 AML other m 2020-12-21T10:57:53.33
IV.VVLD.HHN. ML:1.5 0.00007027471000000001 0.2944 AML other m 2020-12-21T10:57:53.82
IV.MOMA.HHE. ML:1.8 0.00006538922 0.2752 AML other m 2020-12-21T10:57:58.76
IV.MOMA.HHN. ML:1.6 0.00004339248 0.4416 AML other m 2020-12-21T10:58:01.37
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