Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 21-12-2020 and time 22:13:29 (UTC) in region 2 km W Saracinesco (RM)

A magnitude ML 1.2 earthquake occured in region: 2 km W Saracinesco (RM), on

  • 21-12-2020 22:13:29 (UTC)
  • 21-12-2020 23:13:29 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.0110, 12.9290 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
Saracinesco RM 2 185 185
Mandela RM 3 917 1102
Sambuci RM 3 925 2027
Vicovaro RM 3 4019 6046
Anticoli Corrado RM 5 915 6961
Roccagiovine RM 5 263 7224
Cineto Romano RM 5 601 7825
Ciciliano RM 6 1336 9161
Roviano RM 6 1351 10512
Castel Madama RM 6 7399 17911
San Polo dei Cavalieri RM 7 2992 20903
Marano Equo RM 8 779 21682
Licenza RM 8 1011 22693
Arsoli RM 8 1586 24279
Riofreddo RM 8 781 25060
Cerreto Laziale RM 9 1118 26178
Agosta RM 9 1765 27943
Percile RM 10 255 28198
Vallinfreda RM 10 283 28481
Rocca Canterano RM 10 196 28677
Gerano RM 10 1263 29940
Marcellina RM 10 7280 37220
Oricola AQ 10 1244 38464
San Gregorio da Sassola RM 11 1619 40083
Pisoniano RM 12 770 40853
Rocca di Botte AQ 12 856 41709
Canterano RM 12 351 42060
Cervara di Roma RM 12 455 42515
Tivoli RM 12 56533 99048
Vivaro Romano RM 12 182 99230
Casape RM 12 744 99974
Rocca Santo Stefano RM 14 975 100949
Orvinio RI 14 405 101354
Monteflavio RM 14 1348 102702
Poli RM 14 2418 105120
San Vito Romano RM 15 3273 108393
Palombara Sabina RM 15 13269 121662
Camerata Nuova RM 15 447 122109
Pereto AQ 15 682 122791
Turania RI 16 241 123032
Carsoli AQ 16 5396 128428
Bellegra RM 17 2887 131315
Capranica Prenestina RM 17 351 131666
Guidonia Montecelio RM 17 88673 220339
Pozzaglia Sabina RI 17 360 220699
Subiaco RM 17 9074 229773
Collalto Sabino RI 17 442 230215
Montorio Romano RM 17 1984 232199
Moricone RM 17 2650 234849
Gallicano nel Lazio RM 18 6334 241183
Sant'Angelo Romano RM 18 5018 246201
Rocca di Cave RM 18 377 246578
Castel San Pietro Romano RM 18 902 247480
Scandriglia RI 19 3108 250588
Olevano Romano RM 19 6687 257275
Roiate RM 19 737 258012
Palestrina RM 19 21672 279684
Affile RM 20 1548 281232
Nespolo RI 20 246 281478

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km E of Tivoli (56533 inhabitants)
17 Km E of Guidonia Montecelio (88673 inhabitants)
38 Km NE of Velletri (53303 inhabitants)
39 Km E of Roma (2864731 inhabitants)
52 Km NE of Aprilia (73446 inhabitants)
52 Km NE of Pomezia (62966 inhabitants)
54 Km SW of L'Aquila (69753 inhabitants)
60 Km N of Latina (125985 inhabitants)
63 Km E of Fiumicino (78395 inhabitants)
66 Km SE of Terni (111501 inhabitants)
67 Km NE of Anzio (54211 inhabitants)
82 Km SE of Viterbo (67173 inhabitants)
94 Km E of Civitavecchia (52991 inhabitants)
96 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 1.2 2020-12-21
22:13:29		 42.0108 12.929 9 2021-02-26
14:56:17		 Bollettino Sismico Italiano INGV 86638281
Reviewed
Rev100 		ML 1.2 2020-12-21
22:13:29		 42.0002 12.9385 6 2020-12-21
22:18:51		 Sala Sismica INGV-Roma 85611311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-21 22:13:29 ± 0.06
Latitude 42.0108 ± 0.0027
Longitude 12.9290 ± 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 86638281

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 347
Semi-minor axis of confidence ellipse (meter) 270
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 133
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 47
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 32
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) 0.13939
Epicentral distance of station farthest from the epicenter (degree) 0.83547
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 19
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 86638281
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-27 20:32:43

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 85611311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-21 22:18:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MOMA.HHZ. 2020-12-21T22:13:57.69 0.3 undecidable manual S 342 92.7405 50 0.58 58
IV.GAVE.EHZ. 2020-12-21T22:13:52.71 0.6 undecidable manual S 358 75.6687 50 0.17 44
IV.LNSS.HNZ. 2020-12-21T22:13:50.31 0.6 undecidable manual S 8 66.2781 50 0.27 44
IV.VVLD.HHZ. 2020-12-21T22:13:48.78 0.6 undecidable manual S 105 59.3961 50 0.58 41
IV.GIUL.HHZ. 2020-12-21T22:13:47.18 0.6 undecidable manual S 152 56.9985 50 -0.37 44
IV.MOMA.HHZ. 2020-12-21T22:13:45.29 0.3 undecidable manual P 342 92.7405 50 -0.07 66
IV.SMA1.EHN. 2020-12-21T22:13:43.21 1.0 undecidable manual P 26 76.368 50 0.37 21
IV.PTQR.HHZ. 2020-12-21T22:13:43.22 0.6 undecidable manual S 88 38.9277 50 0.49 44
IV.SAMA.EHZ. 2020-12-21T22:13:42.36 0.6 undecidable manual S 228 37.7289 50 -0.06 49
IV.GAVE.EHZ. 2020-12-21T22:13:42.38 0.3 undecidable manual P 358 75.6687 50 -0.34 64
IV.RDP.HHZ. 2020-12-21T22:13:41.26 0.6 undecidable manual S 213 33.1446 104 0.08 49
IV.LRP.EHZ. 2020-12-21T22:13:41.32 0.3 undecidable manual P 126 67.6767 50 -0.18 67
IV.POFI.HNE. 2020-12-21T22:13:41.88 0.3 undecidable manual P 116 72.372 50 -0.34 65
IV.LNSS.HNZ. 2020-12-21T22:13:40.97 0.6 undecidable manual P 8 66.2781 50 -0.31 44
IV.FIAM.HHZ. 2020-12-21T22:13:40.80 0.3 undecidable manual S 28 32.4453 105 -0.16 72
IV.ARRO.EHZ. 2020-12-21T22:13:40.75 0.3 undecidable manual P 348 64.491 50 -0.25 67
IV.RMP.HHZ. 2020-12-21T22:13:39.57 0.6 undecidable manual S 220 28.749 106 -0.16 48
IV.GIUL.HHZ. 2020-12-21T22:13:39.53 0.3 undecidable manual P 152 56.9985 50 -0.31 67
IV.VVLD.HHZ. 2020-12-21T22:13:39.92 0.1 undecidable manual P 105 59.3961 50 -0.29 89
IV.PTQR.HHZ. 2020-12-21T22:13:37.01 0.3 undecidable manual P 88 38.9277 50 -0.05 73
IV.SAMA.EHZ. 2020-12-21T22:13:37.06 0.3 undecidable manual P 228 37.7289 50 0.18 71
IV.SRES.HHN. 2020-12-21T22:13:37.60 0.3 undecidable manual P 306 42.624 50 -0.03 73
IV.RCAV.EHZ. 2020-12-21T22:13:36.33 0.6 undecidable manual S 176 18.1707 115 0.05 50
IV.VIVA.HHN. 2020-12-21T22:13:36.30 0.3 undecidable manual P 204 31.746 105 0.4 69
IV.RDP.HHZ. 2020-12-21T22:13:36.49 0.3 undecidable manual P 213 33.1446 104 0.33 70
IT.CSO1.HGZ. 2020-12-21T22:13:36.40 0.6 undecidable manual S 53 16.4724 117 0.65 43
IV.RMP.HHZ. 2020-12-21T22:13:35.32 0.3 undecidable manual P 220 28.749 106 0 75
IV.FIAM.HHZ. 2020-12-21T22:13:35.90 0.1 undecidable manual P 28 32.4453 105 -0.14 97
IV.MTCE.HHZ. 2020-12-21T22:13:35.12 0.3 undecidable manual S 275 15.4734 119 -0.31 72
IV.RCAV.EHZ. 2020-12-21T22:13:33.55 0.3 undecidable manual P 176 18.1707 115 0.21 73
IT.CSO1.HGZ. 2020-12-21T22:13:32.75 0.3 undecidable manual P 53 16.4724 117 -0.28 72
IV.MTCE.HHZ. 2020-12-21T22:13:32.96 0.1 positive manual P 275 15.4734 119 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTCE.HHN. ML:1.2 0.00017449999999999999 0.94 AML other m 2020-12-21T22:13:35.82
IV.MTCE.HHE. ML:1.5 0.000315 0.38 AML other m 2020-12-21T22:13:35.58
IV.FIAM.HHE. ML:0.8 0.00003235000000000001 0.44 AML other m 2020-12-21T22:13:41.11
IV.RMP.HHE. ML:1.8 0.000307 1.12 AML other m 2020-12-21T22:13:42.21
IV.PTQR.HHE. ML:1.0 0.00003995 0.68 AML other m 2020-12-21T22:13:43.29
IV.PTQR.HHN. ML:0.9 0.0000296 1.74 AML other m 2020-12-21T22:13:44.09
IV.RMP.HHN. ML:1.9 0.000395 0.34 AML other m 2020-12-21T22:13:45.52
IV.FIAM.HHN. ML:1.0 0.00004035 1.58 AML other m 2020-12-21T22:13:47.85
IV.VVLD.HHE. ML:1.1 0.000022800000000000002 0.42 AML other m 2020-12-21T22:13:49.95
IV.VVLD.HHN. ML:1.1 0.00002435 0.34 AML other m 2020-12-21T22:13:55.59
IV.MOMA.HHN. ML:1.3 0.0000202 0.34 AML other m 2020-12-21T22:13:58.50
IV.MOMA.HHE. ML:1.4 0.0000279 0.62 AML other m 2020-12-21T22:13:58.51
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