Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 1.8 on date 22-01-2021 and time 20:34:07 (Italy) in region 2 km E Vicovaro (RM)

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

  • 22-01-2021 19:34:07 (UTC)
  • 22-01-2021 20:34:07 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.01, 12.92 at 8 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Mandela RM 2 917 4936
Saracinesco RM 3 185 5121
Sambuci RM 3 925 6046
Roccagiovine RM 5 263 6309
Cineto Romano RM 6 601 6910
Castel Madama RM 6 7399 14309
Ciciliano RM 6 1336 15645
Anticoli Corrado RM 6 915 16560
Roviano RM 7 1351 17911
San Polo dei Cavalieri RM 7 2992 20903
Licenza RM 7 1011 21914
Marano Equo RM 8 779 22693
Riofreddo RM 9 781 23474
Arsoli RM 9 1586 25060
Cerreto Laziale RM 9 1118 26178
Percile RM 9 255 26433
Marcellina RM 9 7280 33713
Agosta RM 10 1765 35478
Vallinfreda RM 10 283 35761
Gerano RM 11 1263 37024
Rocca Canterano RM 11 196 37220
Oricola AQ 11 1244 38464
San Gregorio da Sassola RM 11 1619 40083
Tivoli RM 11 56533 96616
Casape RM 12 744 97360
Pisoniano RM 12 770 98130
Vivaro Romano RM 12 182 98312
Rocca di Botte AQ 13 856 99168
Canterano RM 13 351 99519
Cervara di Roma RM 13 455 99974
Monteflavio RM 13 1348 101322
Orvinio RI 13 405 101727
Palombara Sabina RM 14 13269 114996
Poli RM 14 2418 117414
Rocca Santo Stefano RM 14 975 118389
San Vito Romano RM 15 3273 121662
Camerata Nuova RM 16 447 122109
Guidonia Montecelio RM 16 88673 210782
Turania RI 16 241 211023
Pereto AQ 16 682 211705
Carsoli AQ 17 5396 217101
Moricone RM 17 2650 219751
Montorio Romano RM 17 1984 221735
Pozzaglia Sabina RI 17 360 222095
Capranica Prenestina RM 17 351 222446
Bellegra RM 17 2887 225333
Sant'Angelo Romano RM 17 5018 230351
Collalto Sabino RI 18 442 230793
Gallicano nel Lazio RM 18 6334 237127
Subiaco RM 18 9074 246201
Scandriglia RI 18 3108 249309
Rocca di Cave RM 19 377 249686
Castel San Pietro Romano RM 19 902 250588
Palestrina RM 19 21672 272260
Olevano Romano RM 19 6687 278947
Roiate RM 20 737 279684
Nerola RM 20 1926 281610

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)
38 Km NE of Velletri (53303 inhabitants)
38 Km E of Roma (2864731 inhabitants)
51 Km NE of Pomezia (62966 inhabitants)
52 Km NE of Aprilia (73446 inhabitants)
55 Km SW of L'Aquila (69753 inhabitants)
61 Km N of Latina (125985 inhabitants)
62 Km E of Fiumicino (78395 inhabitants)
65 Km SE of Terni (111501 inhabitants)
67 Km NE of Anzio (54211 inhabitants)
81 Km SE of Viterbo (67173 inhabitants)
93 Km E of Civitavecchia (52991 inhabitants)
97 Km SW of Teramo (54892 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		Md 1.8 2021-01-22
19:34:07		 42.01 12.92 8 2021-01-22
19:41:44		 Sala Sismica INGV-Roma 86469631
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-22 19:34:07 ± 0.08
Latitude 42.01 ± 0.00
Longitude 12.92 ± 0.01
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86469631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 458
Semi-minor axis of confidence ellipse (meter) 413
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 145
Circular confidence region, given by single value of horizontal uncertainty (meter) 460
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.59625
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 6
Magnitude information

Md:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 4
Type of magnitude Md
Reference to an origin 86469631
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-22 19:41:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.LNSS.HHZ. 2021-01-22T19:34:29.13 0.6 undecidable manual S 9 0.5963 50 0.4 43
IV.PTQR.HHZ. 2021-01-22T19:34:21.79 0.6 undecidable manual S 88 0.357 50 0.14 47
IV.FIAM.HHZ. 2021-01-22T19:34:19.50 0.3 undecidable manual S 30 0.2941 103 0 74
IV.LNSS.HHZ. 2021-01-22T19:34:19.64 1.0 undecidable manual P 9 0.5963 50 -0.27 22
IV.SAMA.EHZ. 2021-01-22T19:34:15.35 0.3 negative manual P 226 0.3363 50 -0.11 72
IV.PTQR.HHZ. 2021-01-22T19:34:15.52 0.3 positive manual P 88 0.357 50 -0.3 69
IV.FIAM.HHZ. 2021-01-22T19:34:14.51 0.1 undecidable manual P 30 0.2941 103 -0.07 97
IV.RCAV.EHZ. 2021-01-22T19:34:14.78 0.6 undecidable manual S 173 0.1664 113 -0.03 50
IV.MTCE.HHZ. 2021-01-22T19:34:13.48 0.6 undecidable manual S 274 0.1322 118 -0.12 50
IV.RCAV.EHZ. 2021-01-22T19:34:12.28 0.6 undecidable manual P 173 0.1664 113 0.41 46
IV.LAV9.HNZ. 2021-01-22T19:34:12.56 3.0 negative manual Pn -4.25 0
IV.MTCE.HHZ. 2021-01-22T19:34:11.26 0.1 positive manual P 274 0.1322 118 0.08 100
IV.RIBO.EHZ.01 2021-01-22T19:34:11.69 3.0 positive manual Pn 1.7 0
IT.OPI.HGZ. 2021-01-22T19:34:10.02 3.0 undecidable manual Pn -3.78 0
IV.CAFI.HHZ. 2021-01-22T19:33:58.28 3.0 undecidable manual Pn -1.56 0
IV.CRTC.HHZ. 2021-01-22T19:33:54.10 3.0 undecidable manual P 4.59 0
IV.MURB.HHZ. 2021-01-22T19:33:53.95 3.0 undecidable manual Pn -3.34 0
RF.GEPF.HHZ. 2021-01-22T19:33:50.57 3.0 positive manual Pn -0.1 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FIAM.HHZ. Md:2 25 END duration s
IV.MTCE.HHZ. Md:1.7 18 END duration s
IV.RCAV.EHZ. Md:1.6 16 END duration s
IV.PTQR.HHZ. Md:1.8 18 END duration s
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download