Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 12-08-2021 and time 07:25:29 (Italy) in region 3 km NW Marcellina (RM)

A magnitude ML 1.9 earthquake occured in region: 3 km NW Marcellina (RM), on

  • 12-08-2021 05:25:29 (UTC)
  • 12-08-2021 07:25:29 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.0490, 12.7980 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
Marcellina RM 3 7280 7280
Palombara Sabina RM 3 13269 20549
San Polo dei Cavalieri RM 5 2992 23541
Sant'Angelo Romano RM 7 5018 28559
Monteflavio RM 8 1348 29907
Moricone RM 8 2650 32557
Guidonia Montecelio RM 8 88673 121230
Roccagiovine RM 8 263 121493
Vicovaro RM 9 4019 125512
Licenza RM 9 1011 126523
Tivoli RM 9 56533 183056
Montorio Romano RM 10 1984 185040
Castel Madama RM 10 7399 192439
Mandela RM 11 917 193356
Percile RM 11 255 193611
Montelibretti RM 11 5323 198934
Nerola RM 13 1926 200860
Mentana RM 13 22921 223781
Sambuci RM 14 925 224706
Scandriglia RI 14 3108 227814
Saracinesco RM 14 185 227999
Cineto Romano RM 14 601 228600
Orvinio RI 15 405 229005
Monterotondo RM 15 40830 269835
Ciciliano RM 15 1336 271171
San Gregorio da Sassola RM 16 1619 272790
Fonte Nuova RM 16 32562 305352
Anticoli Corrado RM 17 915 306267
Roviano RM 17 1351 307618
Riofreddo RM 17 781 308399
Vallinfreda RM 17 283 308682
Casape RM 17 744 309426
Arsoli RM 18 1586 311012
Vivaro Romano RM 18 182 311194
Poggio Moiano RI 18 2751 313945
Pozzaglia Sabina RI 19 360 314305
Poggio Nativo RI 19 2622 316927
Toffia RI 19 1058 317985
Fara in Sabina RI 19 13742 331727
Cerreto Laziale RM 19 1118 332845
Marano Equo RM 19 779 333624
Poli RM 20 2418 336042
Gallicano nel Lazio RM 20 6334 342376

Municipalities with at least 50000 inhabitants

An earthquake occurred to
8 Km NE of Guidonia Montecelio (88673 inhabitants)
9 Km N of Tivoli (56533 inhabitants)
31 Km NE of Roma (2864731 inhabitants)
40 Km N of Velletri (53303 inhabitants)
49 Km NE of Pomezia (62966 inhabitants)
52 Km N of Aprilia (73446 inhabitants)
56 Km NE of Fiumicino (78395 inhabitants)
58 Km S of Terni (111501 inhabitants)
60 Km SW of L'Aquila (69753 inhabitants)
65 Km N of Latina (125985 inhabitants)
68 Km N of Anzio (54211 inhabitants)
70 Km SE of Viterbo (67173 inhabitants)
83 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 1.9 2021-08-12
05:25:29		 42.0488 12.7978 8 2021-12-29
11:12:24		 Bollettino Sismico Italiano INGV 94917141
Reviewed
Rev100 		ML 1.9 2021-08-12
05:25:29		 42.0467 12.7883 7 2021-08-12
05:30:40		 Sala Sismica INGV-Roma 93990951
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-12 05:25:29 ± 0.06
Latitude 42.0488 ± 0.0045
Longitude 12.7978 ± 0.0061
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 94917141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 542
Semi-minor axis of confidence ellipse (meter) 374
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 222
Circular confidence region, given by single value of horizontal uncertainty (meter) 540.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 42
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.04856
Epicentral distance of station farthest from the epicenter (degree) 1.00005
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 94917141
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-18 16:02:44

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 93990951
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-12 05:30:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VVLD.HHZ. 2021-08-12T05:25:52.21 1.0 undecidable manual S 106 70.8735 50 0.53 20
IV.BARO.EHZ. 2021-08-12T05:25:50.85 0.6 undecidable manual S 290 65.2902 50 0.68 39
IV.RM33.EHZ. 2021-08-12T05:25:49.95 0.6 undecidable manual S 34 61.3941 50 0.8 37
IV.MGAB.HHZ. 2021-08-12T05:25:49.64 0.6 undecidable manual P 330 111 50 1.1 29
IV.MC2.EHZ. 2021-08-12T05:25:47.74 0.3 undecidable manual P 18 100.9212 50 0.76 53
IV.MMO1.EHN. 2021-08-12T05:25:47.57 0.6 undecidable manual P 24 103.8183 50 0.14 42
IV.PTQR.HHZ. 2021-08-12T05:25:46.16 0.6 undecidable manual S 93 49.7169 50 0.14 46
IV.MTRA.EHE. 2021-08-12T05:25:45.20 0.6 undecidable manual P 32 92.5407 50 -0.5 40
IV.NRCA.HHZ. 2021-08-12T05:25:44.88 0.3 undecidable manual P 16 90.8424 50 -0.54 59
IV.MOMA.HNZ. 2021-08-12T05:25:44.51 0.3 undecidable manual P 348 85.8474 50 -0.14 65
IV.CAMP.HHE. 2021-08-12T05:25:42.42 0.3 undecidable manual P 43 73.6707 50 -0.37 63
IV.GAVE.EHN. 2021-08-12T05:25:42.17 0.3 undecidable manual P 6 71.7726 50 -0.32 64
IV.FIAM.HHZ. 2021-08-12T05:25:42.67 0.6 undecidable manual S 47 35.742 50 0.37 45
IV.VVLD.HHZ. 2021-08-12T05:25:41.99 0.3 undecidable manual P 106 70.8735 50 -0.37 64
IV.TOLF.HHN. 2021-08-12T05:25:41.57 0.3 undecidable manual P 272 65.6898 50 0.01 69
IV.CESX.HHE. 2021-08-12T05:25:41.33 0.3 undecidable manual P 344 64.491 50 -0.03 69
IV.BARO.EHZ. 2021-08-12T05:25:41.51 0.3 undecidable manual P 290 65.2902 50 0.02 69
IV.RM33.EHZ. 2021-08-12T05:25:40.59 0.3 undecidable manual P 34 61.3941 50 -0.31 66
IV.LNSS.HNZ. 2021-08-12T05:25:40.91 0.3 undecidable manual P 18 64.5909 50 -0.47 63
IV.SRES.HHZ. 2021-08-12T05:25:40.78 0.6 undecidable manual S 311 31.5462 104 -0.16 48
IV.GUAR.HNN. 2021-08-12T05:25:39.16 0.3 undecidable manual P 123 51.0156 50 -0.12 70
IT.MMP1.HGE. 2021-08-12T05:25:38.19 0.6 undecidable manual S 350 22.5552 110 0.23 48
IV.PTQR.HHZ. 2021-08-12T05:25:38.95 0.3 undecidable manual P 93 49.7169 50 -0.14 69
IV.RCAV.EHZ. 2021-08-12T05:25:38.71 0.6 undecidable manual S 151 25.4523 108 -0.18 48
IV.CERT.HHZ. 2021-08-12T05:25:37.15 0.6 undecidable manual S 126 18.7701 113 0.43 46
IV.SRES.HHZ. 2021-08-12T05:25:36.00 0.3 undecidable manual P 311 31.5462 104 -0.16 72
IV.RDP.HHZ. 2021-08-12T05:25:36.50 0.3 undecidable manual P 193 32.8449 104 0.1 72
IV.FIAM.HHZ. 2021-08-12T05:25:36.69 0.3 undecidable manual P 47 35.742 50 -0.25 70
IT.CSO1.HGZ. 2021-08-12T05:25:35.03 0.3 undecidable manual P 76 24.5532 108 0.22 72
IV.RMP.HHN. 2021-08-12T05:25:35.51 0.3 undecidable manual P 196 27.3504 106 0.16 72
IV.RCAV.EHZ. 2021-08-12T05:25:34.89 0.1 undecidable manual P 151 25.4523 108 -0.09 98
IT.MMP1.HGE. 2021-08-12T05:25:34.62 0.3 undecidable manual P 350 22.5552 110 0.18 72
IV.CERT.HHZ. 2021-08-12T05:25:33.90 0.1 undecidable manual P 126 18.7701 113 0.18 97
IV.MTCE.HHZ. 2021-08-12T05:25:32.98 0.6 undecidable manual S 238 5.3946 146 -0.03 51
IV.MTCE.HHZ. 2021-08-12T05:25:31.43 0.1 negative manual P 238 5.3946 146 -0.15 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SRES.HHN. ML:1.4 0.0001319107 0.56 AML other m 2021-08-12T05:25:41.41
IV.CERT.HHN. ML:2.0 0.0008814999999999999 0.44 AML other m 2021-08-12T05:25:41.87
IV.CERT.HNN. ML:2.0 0.0009339999999999999 0.46 AML other m 2021-08-12T05:25:41.87
IV.CERT.HHE. ML:2.2 0.00135 0.66 AML other m 2021-08-12T05:25:42.12
IV.CERT.HNE. ML:2.2 0.0012549999999999998 0.64 AML other m 2021-08-12T05:25:42.12
IV.SRES.HHE. ML:1.4 0.00011649999999999999 1.68 AML other m 2021-08-12T05:25:44.86
IV.PTQR.HHN. ML:1.7 0.00013319324499999998 1.3408 AML other m 2021-08-12T05:25:46.07
IV.PTQR.HHE. ML:1.9 0.000194 1.74 AML other m 2021-08-12T05:25:47.90
IV.FIAM.HHE. ML:1.9 0.0002925 0.78 AML other m 2021-08-12T05:25:48.59
IV.FIAM.HHN. ML:1.8 0.000249 1 AML other m 2021-08-12T05:25:49.52
IV.FIAM.HNN. ML:2.1 0.00047530249999999994 0.8992 AML other m 2021-08-12T05:25:50.47
IV.FIAM.HNE. ML:2.7 0.0019729832 0.5504 AML other m 2021-08-12T05:25:50.64
IV.VVLD.HNE. ML:2.0 0.00016117629999999998 1.0592 AML other m 2021-08-12T05:25:51.34
IV.RM33.HNN. ML:2.0 0.00020982115 0.64 AML other m 2021-08-12T05:25:54.01
IV.RM33.HNE. ML:2.0 0.00021337315000000002 0.72 AML other m 2021-08-12T05:25:55.42
IV.BARO.EHN. ML:1.7 0.00009389999999999999 1.5 AML other m 2021-08-12T05:25:55.01
IV.RM33.EHE. ML:2.0 0.0001793076 0.4416 AML other m 2021-08-12T05:25:58.47
IV.VVLD.HHE. ML:1.7 0.000091466805 0.9824 AML other m 2021-08-12T05:25:58.30
IV.RM33.EHN. ML:1.8 0.0001414333 0.6784 AML other m 2021-08-12T05:25:59.13
IV.BARO.EHE. ML:1.4 0.00005185 0.52 AML other m 2021-08-12T05:25:59.79
IV.VVLD.HHN. ML:1.9 0.00011945105000000001 1.5008 AML other m 2021-08-12T05:25:59.78
IV.BARO.HNE. ML:1.8 0.00011783115 0.72 AML other m 2021-08-12T05:26:00.15
IV.VVLD.HNN. ML:2.0 0.0001516044 0.64 AML other m 2021-08-12T05:26:01.30
IV.BARO.HNN. ML:1.8 0.00012169864999999999 1.1808 AML other m 2021-08-12T05:26:07.71
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