Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 25-10-2021 and time 16:25:38 (Italy) in region 2 km S Ciciliano (RM)

A magnitude ML 1.4 earthquake occured in region: 2 km S Ciciliano (RM), on

  • 25-10-2021 14:25:38 (UTC)
  • 25-10-2021 16:25:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.9450, 12.9390 at 10 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
Ciciliano RM 2 1336 1336
Cerreto Laziale RM 4 1118 2454
Pisoniano RM 4 770 3224
Gerano RM 5 1263 4487
Sambuci RM 5 925 5412
Casape RM 6 744 6156
San Gregorio da Sassola RM 6 1619 7775
Castel Madama RM 7 7399 15174
Saracinesco RM 7 185 15359
Rocca Canterano RM 7 196 15555
Poli RM 7 2418 17973
San Vito Romano RM 8 3273 21246
Rocca Santo Stefano RM 8 975 22221
Canterano RM 8 351 22572
Anticoli Corrado RM 9 915 23487
Marano Equo RM 9 779 24266
Agosta RM 9 1765 26031
Vicovaro RM 9 4019 30050
Capranica Prenestina RM 9 351 30401
Mandela RM 10 917 31318
Bellegra RM 10 2887 34205
Roviano RM 10 1351 35556
Rocca di Cave RM 11 377 35933
San Polo dei Cavalieri RM 11 2992 38925
Castel San Pietro Romano RM 11 902 39827
Cervara di Roma RM 12 455 40282
Tivoli RM 12 56533 96815
Cineto Romano RM 12 601 97416
Olevano Romano RM 12 6687 104103
Roccagiovine RM 12 263 104366
Palestrina RM 12 21672 126038
Arsoli RM 13 1586 127624
Gallicano nel Lazio RM 13 6334 133958
Genazzano RM 13 6036 139994
Roiate RM 13 737 140731
Subiaco RM 14 9074 149805
Riofreddo RM 14 781 150586
Marcellina RM 14 7280 157866
Cave RM 14 11287 169153
Rocca di Botte AQ 14 856 170009
Oricola AQ 14 1244 171253
Zagarolo RM 15 17843 189096
Affile RM 15 1548 190644
Licenza RM 15 1011 191655
Arcinazzo Romano RM 16 1348 193003
Camerata Nuova RM 16 447 193450
Vallinfreda RM 16 283 193733
Percile RM 17 255 193988
Serrone FR 17 3099 197087
San Cesareo RM 18 15153 212240
Labico RM 18 6379 218619
Vivaro Romano RM 18 182 218801
Paliano FR 18 8281 227082
Pereto AQ 19 682 227764
Valmontone RM 19 15959 243723
Guidonia Montecelio RM 19 88673 332396
Colonna RM 20 4287 336683
Palombara Sabina RM 20 13269 349952

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km E of Tivoli (56533 inhabitants)
19 Km E of Guidonia Montecelio (88673 inhabitants)
32 Km NE of Velletri (53303 inhabitants)
38 Km E of Roma (2864731 inhabitants)
46 Km NE of Aprilia (73446 inhabitants)
47 Km NE of Pomezia (62966 inhabitants)
53 Km N of Latina (125985 inhabitants)
59 Km SW of L'Aquila (69753 inhabitants)
61 Km NE of Anzio (54211 inhabitants)
61 Km E of Fiumicino (78395 inhabitants)
73 Km SE of Terni (111501 inhabitants)
87 Km SE of Viterbo (67173 inhabitants)
96 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 1.4 2021-10-25
14:25:38		 41.9447 12.9393 10 2022-03-30
13:04:37		 Bollettino Sismico Italiano INGV 101052651
Reviewed
Rev100 		ML 1.4 2021-10-25
14:25:38		 41.9452 12.9407 10 2021-10-25
14:34:09		 Sala Sismica INGV-Roma 96981751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-25 14:25:38 ± 0.05
Latitude 41.9447 ± 0.0027
Longitude 12.9393 ± 0.0048
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 101052651

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 470
Semi-minor axis of confidence ellipse (meter) 220
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 63
Circular confidence region, given by single value of horizontal uncertainty (meter) 470.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 120
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.03148
Epicentral distance of station farthest from the epicenter (degree) 0.45056
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 101052651
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-16 16:41:07

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 96981751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-25 14:34:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SRES.HHZ. 2021-10-25T14:25:54.01 0.6 undecidable manual S 313 48.0186 50 -0.02 47
IV.LATB.EHZ. 2021-10-25T14:25:54.64 0.6 undecidable manual S 178 50.0166 50 0.06 47
IV.LATB.EHZ. 2021-10-25T14:25:47.56 0.6 undecidable manual P 178 50.0166 50 -0.19 46
IV.SRES.HHZ. 2021-10-25T14:25:47.48 0.3 undecidable manual P 313 48.0186 50 0.04 71
IV.FIAM.HNE. 2021-10-25T14:25:45.92 1.0 undecidable manual P 22 38.7279 50 -0.09 24
IV.MTCE.HHZ. 2021-10-25T14:25:45.63 0.6 undecidable manual S 298 18.4704 117 0 50
IV.RCAV.EHZ. 2021-10-25T14:25:43.35 0.3 undecidable manual S 177 10.7781 131 -0.07 75
IV.MTCE.HHZ. 2021-10-25T14:25:42.54 0.3 undecidable manual P 298 18.4704 117 -0.04 75
IV.CERT.HHZ. 2021-10-25T14:25:41.82 0.3 undecidable manual S 82 3.4965 160 -0.13 75
IV.RCAV.EHZ. 2021-10-25T14:25:41.42 0.1 undecidable manual P 177 10.7781 131 0.11 100
IV.CERT.HHZ. 2021-10-25T14:25:40.61 0.1 undecidable manual P 82 3.4965 160 0.15 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CERT.HNN. ML:1.6 0.0008043877000000001 0.2624 AML other m 2021-10-25T14:25:42.19
IV.CERT.HHN. ML:1.7 0.00090933655 0.2624 AML other m 2021-10-25T14:25:42.20
IV.CERT.HNE. ML:1.7 0.0008869235500000002 0.16 AML other m 2021-10-25T14:25:43.10
IV.CERT.HHE. ML:1.5 0.000558 0.34 AML other m 2021-10-25T14:25:43.11
IV.RCAV.EHN. ML:1.3 0.000275 0.34 AML other m 2021-10-25T14:25:43.71
IV.RCAV.EHE. ML:1.5 0.000359 1.58 AML other m 2021-10-25T14:25:44.10
IV.SRES.HHN. ML:1.0 0.000030792809999999995 1.6608 AML other m 2021-10-25T14:25:54.98
IV.SRES.HHE. ML:1.0 0.000025692134999999997 0.3008 AML other m 2021-10-25T14:25:55.86
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