Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 31-01-2021 and time 05:48:32 (Italy) in region 2 km SE Vicovaro (RM)

A magnitude ML 1.8 earthquake occured in region: 2 km SE Vicovaro (RM), on

  • 31-01-2021 04:48:32 (UTC)
  • 31-01-2021 05:48:32 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.0030, 12.9160 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 3 185 5129
Mandela RM 3 917 6046
Castel Madama RM 5 7399 13445
Ciciliano RM 5 1336 14781
Roccagiovine RM 6 263 15044
San Polo dei Cavalieri RM 6 2992 18036
Anticoli Corrado RM 6 915 18951
Cineto Romano RM 7 601 19552
Roviano RM 7 1351 20903
Licenza RM 8 1011 21914
Cerreto Laziale RM 8 1118 23032
Marano Equo RM 9 779 23811
Marcellina RM 9 7280 31091
Arsoli RM 10 1586 32677
Riofreddo RM 10 781 33458
Agosta RM 10 1765 35223
San Gregorio da Sassola RM 10 1619 36842
Gerano RM 10 1263 38105
Percile RM 10 255 38360
Rocca Canterano RM 10 196 38556
Tivoli RM 11 56533 95089
Casape RM 11 744 95833
Pisoniano RM 11 770 96603
Vallinfreda RM 11 283 96886
Oricola AQ 12 1244 98130
Canterano RM 12 351 98481
Cervara di Roma RM 13 455 98936
Rocca di Botte AQ 13 856 99792
Poli RM 13 2418 102210
Vivaro Romano RM 13 182 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 16 88673 210335
Capranica Prenestina RM 16 351 210686
Camerata Nuova RM 16 447 211133
Bellegra RM 16 2887 214020
Gallicano nel Lazio RM 17 6334 220354
Pereto AQ 17 682 221036
Turania RI 17 241 221277
Sant'Angelo Romano RM 17 5018 226295
Moricone RM 17 2650 228945
Carsoli AQ 17 5396 234341
Castel San Pietro Romano RM 17 902 235243
Rocca di Cave RM 18 377 235620
Montorio Romano RM 18 1984 237604
Subiaco RM 18 9074 246678
Pozzaglia Sabina RI 18 360 247038
Palestrina RM 18 21672 268710
Olevano Romano RM 19 6687 275397
Collalto Sabino RI 19 442 275839
Roiate RM 19 737 276576
Scandriglia RI 19 3108 279684
Zagarolo RM 19 17843 297527
Genazzano RM 20 6036 303563
Affile RM 20 1548 305111

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km E of Tivoli (56533 inhabitants)
16 Km E of Guidonia Montecelio (88673 inhabitants)
37 Km NE of Velletri (53303 inhabitants)
38 Km E of Roma (2864731 inhabitants)
50 Km NE of Pomezia (62966 inhabitants)
51 Km NE of Aprilia (73446 inhabitants)
56 Km SW of L'Aquila (69753 inhabitants)
59 Km N of Latina (125985 inhabitants)
62 Km E of Fiumicino (78395 inhabitants)
66 Km SE of Terni (111501 inhabitants)
66 Km NE of Anzio (54211 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 1.8 2021-01-31
04:48:32		 42.003 12.916 9 2021-07-12
16:54:59		 Bollettino Sismico Italiano INGV 87183771
Reviewed
Rev100 		ML 1.8 2021-01-31
04:48:32		 42.006 12.9165 9 2021-01-31
05:22:05		 Sala Sismica INGV-Roma 86730971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-31 04:48:32 ± 0.08
Latitude 42.0030 ± 0.0036
Longitude 12.9160 ± 0.0061
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87183771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 390
Semi-minor axis of confidence ellipse (meter) 315
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 139
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 52
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 40
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.13040
Epicentral distance of station farthest from the epicenter (degree) 0.80130
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 26
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 87183771
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-29 14:06:11

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 86730971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-31 05:22:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CESX.HHE. 2021-01-31T04:48:56.40 0.6 undecidable manual S 338 72.372 50 1.3 32
IV.VVLD.HHZ. 2021-01-31T04:48:51.79 0.6 undecidable manual S 104 60.1953 50 -0.06 52
IV.TERO.HHN. 2021-01-31T04:48:49.30 0.6 undecidable manual P 39 88.9443 50 1.04 36
IV.SMA1.EHN. 2021-01-31T04:48:47.72 0.6 undecidable manual P 26 77.6667 50 1.2 34
IV.PTQR.HHZ. 2021-01-31T04:48:46.44 0.3 undecidable manual S 87 40.0266 50 -0.01 82
IV.GUAR.HHE. 2021-01-31T04:48:46.58 0.3 undecidable manual S 125 40.0266 50 0.11 80
IV.T0110.HHZ. 2021-01-31T04:48:46.62 0.6 undecidable manual P 70 75.0693 50 0.49 46
IV.CESX.HHE. 2021-01-31T04:48:45.97 0.3 undecidable manual P 338 72.372 50 0.26 73
IV.LRP.EHN. 2021-01-31T04:48:45.25 0.3 undecidable manual P 125 68.0763 50 0.21 75
IV.SAMA.EHN. 2021-01-31T04:48:45.40 0.3 undecidable manual S 227 36.3414 50 -0.09 81
IV.POFI.HNE. 2021-01-31T04:48:45.30 0.3 undecidable manual P 115 72.9714 50 -0.5 69
IV.MA9.HHN. 2021-01-31T04:48:44.88 0.6 undecidable manual S 219 33.4443 50 0.17 53
IV.RDP.HHE. 2021-01-31T04:48:44.54 0.6 undecidable manual S 212 31.8459 50 0.26 52
IV.FIAM.HNE. 2021-01-31T04:48:44.07 0.6 undecidable manual S 29 33.744 50 -0.71 46
IV.LNSS.HHN. 2021-01-31T04:48:44.21 0.3 undecidable manual P 9 67.2771 50 -0.71 64
IV.ARRO.EHZ. 2021-01-31T04:48:44.74 0.6 undecidable manual P 349 65.0904 50 0.16 50
MN.AQU.HNN. 2021-01-31T04:48:43.70 0.3 undecidable manual P 46 55.9995 50 0.52 71
IV.RM33.HNE. 2021-01-31T04:48:43.50 0.3 undecidable manual P 23 61.2942 50 -0.49 71
IV.VIVA.HHN. 2021-01-31T04:48:43.95 0.3 undecidable manual S 203 30.5472 50 0.02 83
IT.MMP1.HGN. 2021-01-31T04:48:43.63 0.6 undecidable manual S 333 30.5472 50 -0.31 52
IV.VVLD.HHZ. 2021-01-31T04:48:43.40 0.3 undecidable manual P 104 60.1953 50 -0.43 72
IV.RMP.HHN. 2021-01-31T04:48:42.76 0.6 undecidable manual S 219 27.4503 108 -0.15 54
IV.LATB.EHZ. 2021-01-31T04:48:42.84 0.3 undecidable manual P 176 56.5989 50 -0.44 73
IV.PTQR.HHZ. 2021-01-31T04:48:40.56 0.3 undecidable manual P 87 40.0266 50 -0.16 79
IV.MA9.HHN. 2021-01-31T04:48:40.07 0.3 undecidable manual P 219 33.4443 50 0.36 77
IV.GUAR.HHE. 2021-01-31T04:48:40.74 0.3 undecidable manual P 125 40.0266 50 0.01 82
IT.CSO1.HGE. 2021-01-31T04:48:40.03 0.3 undecidable manual S 52 17.871 117 0.2 82
IV.SRES.HHN. 2021-01-31T04:48:40.84 0.3 undecidable manual P 308 42.3243 50 -0.23 78
IV.LAV9.HHZ. 2021-01-31T04:48:40.84 0.3 undecidable manual P 207 40.3263 50 0.08 81
IV.SAMA.EHN. 2021-01-31T04:48:39.94 0.3 undecidable manual P 227 36.3414 50 -0.22 79
IV.RCAV.EHE. 2021-01-31T04:48:39.76 0.6 undecidable manual S 172 17.4714 117 0.06 56
IV.RDP.HHE. 2021-01-31T04:48:39.37 0.6 undecidable manual P 212 31.8459 50 -0.09 54
IV.FIAM.HNE. 2021-01-31T04:48:39.28 0.1 undecidable manual P 29 33.744 50 -0.47 100
IV.VIVA.HHN. 2021-01-31T04:48:39.66 0.3 undecidable manual P 203 30.5472 50 0.41 77
IT.MMP1.HGN. 2021-01-31T04:48:39.39 0.3 undecidable manual P 333 30.5472 50 0.12 81
IV.MTCE.HHZ. 2021-01-31T04:48:38.64 0.3 undecidable manual S 279 14.4744 122 -0.17 83
IV.RMP.HHN. 2021-01-31T04:48:38.47 0.6 undecidable manual P 219 27.4503 108 -0.2 54
IT.CSO1.HGE. 2021-01-31T04:48:37.03 0.3 undecidable manual P 52 17.871 117 0.14 83
IV.MTCE.HHZ. 2021-01-31T04:48:36.30 0.3 undecidable manual P 279 14.4744 122 0 86
IV.RCAV.EHE. 2021-01-31T04:48:36.90 0.3 undecidable manual P 172 17.4714 117 0.08 84
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RDP.HHN. ML:1.8 0.00028807785000000005 0.2784 AML other m 2021-01-31T04:48:45.38
IV.VIVA.HHN. ML:1.9 0.00040194895 0.1408 AML other m 2021-01-31T04:48:45.30
IV.VIVA.HHE. ML:1.8 0.00033599895 0.16 AML other m 2021-01-31T04:48:45.38
IV.RDP.HHE. ML:1.5 0.0001501697 0.2016 AML other m 2021-01-31T04:48:45.43
IV.LAV9.HNN. ML:1.9 0.00029488055 1.8176 AML other m 2021-01-31T04:48:47.06
IV.LAV9.HHN. ML:1.9 0.0002846691 1.84 AML other m 2021-01-31T04:48:47.05
IV.LAV9.HNE. ML:2.0 0.0003036107 1.8784 AML other m 2021-01-31T04:48:49.96
IV.LNSS.HHE. ML:1.4 0.000042303345 0.1792 AML other m 2021-01-31T04:48:57.56
IV.LNSS.HHN. ML:1.5 0.000055991775 0.16 AML other m 2021-01-31T04:48:58.99
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