Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 08-12-2021 and time 07:31:26 (Italy) in region 4 km N Colonna (RM)

A magnitude ML 1.5 earthquake occured in region: 4 km N Colonna (RM), on

  • 08-12-2021 06:31:26 (UTC)
  • 08-12-2021 07:31:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.8680, 12.7610 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
Colonna RM 4 4287 4287
Gallicano nel Lazio RM 5 6334 10621
San Cesareo RM 6 15153 25774
Zagarolo RM 7 17843 43617
Monte Porzio Catone RM 7 8693 52310
Monte Compatri RM 7 11978 64288
Rocca Priora RM 8 11962 76250
Frascati RM 9 22087 98337
San Gregorio da Sassola RM 11 1619 99956
Palestrina RM 11 21672 121628
Poli RM 11 2418 124046
Tivoli RM 11 56533 180579
Casape RM 11 744 181323
Castel San Pietro Romano RM 11 902 182225
Grottaferrata RM 12 20327 202552
Rocca di Papa RM 12 17034 219586
Marino RM 14 43026 262612
Labico RM 14 6379 268991
Ciampino RM 15 38412 307403
Guidonia Montecelio RM 15 88673 396076
Castel Madama RM 15 7399 403475
Cave RM 15 11287 414762
Rocca di Cave RM 16 377 415139
Capranica Prenestina RM 16 351 415490
Castel Gandolfo RM 16 8997 424487
Valmontone RM 16 15959 440446
Lariano RM 17 13432 453878
Nemi RM 17 1943 455821
Pisoniano RM 17 770 456591
Albano Laziale RM 18 41715 498306
San Polo dei Cavalieri RM 18 2992 501298
Marcellina RM 18 7280 508578
Ariccia RM 18 19407 527985
Genazzano RM 18 6036 534021
Ciciliano RM 18 1336 535357
San Vito Romano RM 19 3273 538630
Fonte Nuova RM 19 32562 571192
Genzano di Roma RM 19 23970 595162
Sant'Angelo Romano RM 19 5018 600180
Artena RM 19 14276 614456
Vicovaro RM 20 4019 618475
Sambuci RM 20 925 619400

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km S of Tivoli (56533 inhabitants)
15 Km S of Guidonia Montecelio (88673 inhabitants)
20 Km N of Velletri (53303 inhabitants)
23 Km E of Roma (2864731 inhabitants)
31 Km NE of Pomezia (62966 inhabitants)
32 Km N of Aprilia (73446 inhabitants)
45 Km E of Fiumicino (78395 inhabitants)
46 Km N of Latina (125985 inhabitants)
48 Km N of Anzio (54211 inhabitants)
75 Km SW of L'Aquila (69753 inhabitants)
78 Km S of Terni (111501 inhabitants)
82 Km SE of Viterbo (67173 inhabitants)
84 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 1.5 2021-12-08
06:31:26		 41.8677 12.7613 10 2022-03-30
13:04:35		 Bollettino Sismico Italiano INGV 100569451
Reviewed
Rev100 		ML 2.1 2021-12-08
06:31:26		 41.8812 12.7473 11 2021-12-08
06:39:36		 Sala Sismica INGV-Roma 98275971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-08 06:31:26 ± 0.07
Latitude 41.8677 ± 0.0036
Longitude 12.7613 ± 0.0072
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 100569451

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 565
Semi-minor axis of confidence ellipse (meter) 321
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 275
Circular confidence region, given by single value of horizontal uncertainty (meter) 570.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 37
Number of defining phases 25
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.25455
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:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 15
Type of magnitude ML
Reference to an origin 100569451
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-03 16:05:54

ML:2.1

Field Value
Value 2.1
Uncertainty 0.4
Num. used stations 12
Type of magnitude ML
Reference to an origin 98275971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-08 06:39:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.CANO.HHZ. 2021-12-08T06:33:01.48 3.0 undecidable manual Sn -3.06 0
AC.VLO.HHZ. 2021-12-08T06:32:53.11 3.0 undecidable manual Pn 8.7 0
IV.ESCV.HHZ. 2021-12-08T06:32:35.13 3.0 negative manual Pn 4.24 0
IV.IMOL.HNZ. 2021-12-08T06:32:30.47 3.0 undecidable manual Sn -1.67 0
IV.SNAL.HHZ. 2021-12-08T06:32:30.00 3.0 undecidable manual Sn 0.71 0
IX.SSB3.HHZ.02 2021-12-08T06:32:27.86 3.0 undecidable manual Sn -0.22 0
GU.GENL.EHZ. 2021-12-08T06:32:21.00 3.0 positive manual Pn 4.8 0
IV.CELB.HHZ. 2021-12-08T06:32:19.01 3.0 undecidable manual Sg 3.09 0
MN.TRI.HHZ. 2021-12-08T06:32:19.68 3.0 positive manual Pn -1.86 0
IV.CPGN.EHZ. 2021-12-08T06:31:55.61 3.0 undecidable manual Pn 2.02 0
IV.PP3.EHZ. 2021-12-08T06:31:50.10 3.0 negative manual Pn -1.24 0
IV.MNTT.EHZ. 2021-12-08T06:31:49.31 3.0 positive manual P 1.58 0
IV.MML1.EHZ. 2021-12-08T06:31:49.59 0.3 undecidable manual P 7 139.2606 50 0.16 57
IV.NRCA.HHZ. 2021-12-08T06:31:45.18 0.3 undecidable manual P 15 111 50 0.11 61
IT.MMP1.HGE. 2021-12-08T06:31:41.11 0.3 undecidable manual S 359 42.3243 50 0.72 59
IV.LATB.EHE. 2021-12-08T06:31:40.86 0.3 undecidable manual S 158 44.7219 50 -0.15 69
IT.CSO1.HGZ. 2021-12-08T06:31:39.28 0.6 undecidable manual S 46 37.3293 50 0.23 46
IV.FIAM.HNN. 2021-12-08T06:31:36.20 0.3 undecidable manual P 33 53.2023 50 0.04 69
IV.SRES.HHN. 2021-12-08T06:31:35.07 0.6 undecidable manual P 333 45.9207 50 0.03 47
IV.GIUL.HHZ. 2021-12-08T06:31:35.89 0.3 undecidable manual P 130 53.3022 50 -0.3 66
IV.CERT.HHZ. 2021-12-08T06:31:34.04 0.6 undecidable manual S 64 20.2686 117 -0.28 46
IT.MMP1.HGE. 2021-12-08T06:31:34.42 0.6 undecidable manual P 359 42.3243 50 -0.07 47
IV.LATB.EHE. 2021-12-08T06:31:34.50 0.3 undecidable manual P 158 44.7219 50 -0.35 66
IV.RCAV.EHZ. 2021-12-08T06:31:33.13 0.3 undecidable manual S 98 15.3735 124 0.29 70
IV.MTCE.HHZ. 2021-12-08T06:31:33.17 0.3 undecidable manual S 355 17.2716 121 -0.23 71
IV.RDP.HHZ. 2021-12-08T06:31:32.27 0.3 undecidable manual S 200 12.5763 129 0.2 72
IV.VIVA.HHZ. 2021-12-08T06:31:32.91 0.3 undecidable manual S 177 13.0758 128 0.72 62
IT.CSO1.HGZ. 2021-12-08T06:31:32.79 1.0 undecidable manual P 46 37.3293 50 -0.93 18
IV.LAV9.HHZ. 2021-12-08T06:31:31.21 1.0 undecidable manual P 194 21.6672 115 -0.03 24
IV.RMP.HHZ. 2021-12-08T06:31:30.66 0.3 undecidable manual S 217 7.7811 143 -0.22 72
IV.MTCE.HHZ. 2021-12-08T06:31:30.31 0.1 undecidable manual P 355 17.2716 121 -0.15 96
IV.SAMA.EHZ. 2021-12-08T06:31:30.24 0.3 undecidable manual P 235 16.9719 121 -0.17 72
IV.CERT.HHZ. 2021-12-08T06:31:30.92 0.3 undecidable manual P 64 20.2686 117 -0.07 73
IV.RCAV.EHZ. 2021-12-08T06:31:30.13 0.1 undecidable manual P 98 15.3735 124 0 99
IV.VIVA.HHZ. 2021-12-08T06:31:29.40 0.6 undecidable manual P 177 13.0758 128 -0.35 46
IV.RMP.HHZ. 2021-12-08T06:31:29.04 0.1 negative manual P 217 7.7811 143 0.04 100
IV.RDP.HHZ. 2021-12-08T06:31:29.93 0.6 undecidable manual P 200 12.5763 129 0.24 48
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTCE.HHN. ML:1.7 0.000398 0.34 AML other m 2021-12-08T06:31:33.59
IV.MTCE.HHE. ML:1.6 0.00033650000000000005 0.34 AML other m 2021-12-08T06:31:33.73
IV.RDP.HHE. ML:2.1 0.0015327790000000002 0.2208 AML other m 2021-12-08T06:31:34.16
IV.CERT.HHN. ML:1.5 0.000247 0.26 AML other m 2021-12-08T06:31:34.83
IV.RDP.HHN. ML:2.2 0.001559955 0.2976 AML other m 2021-12-08T06:31:32.66
IV.CERT.HHE. ML:1.2 0.00011149999999999999 0.36 AML other m 2021-12-08T06:31:36.79
IV.LAV9.HHE. ML:2.0 0.0007084037999999999 0.2976 AML other m 2021-12-08T06:31:40.71
IV.LAV9.HHN. ML:1.9 0.0005824486500000001 0.2816 AML other m 2021-12-08T06:31:37.79
IV.SAMA.EHE. ML:1.2 0.00014511209999999998 0.2208 AML other m 2021-12-08T06:31:35.92
IV.CERT.HNN. ML:1.5 0.0002402077 0.2592 AML other m 2021-12-08T06:31:34.70
IV.CERT.HNE. ML:1.5 0.00023997099999999998 0.2016 AML other m 2021-12-08T06:31:35.39
IV.GIUL.HHN. ML:1.3 0.000048708415 0.2624 AML other m 2021-12-08T06:31:48.98
IV.GIUL.HHE. ML:1.2 0.00004247295 0.24 AML other m 2021-12-08T06:31:46.25
IV.NRCA.HHE. ML:1.2 0.000015076573000000002 0.08 AML other m 2021-12-08T06:31:59.96
IV.NRCA.HHN. ML:1.4 0.000020004446000000004 0.08 AML other m 2021-12-08T06:31:59.83
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
Waveforms Seismic signals in miniseed + resp format Download