Earthquake with magnitude of ML 2.1 on date 18-12-2020 and time 18:25:26 (Italy) in region 2 km SW Lanuvio (RM)

A magnitude ML 2.1 earthquake occured in region: 2 km SW Lanuvio (RM), on

  • 18-12-2020 17:25:26 (UTC)
  • 18-12-2020 18:25:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.6690, 12.6960 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Lanuvio RM 2 13632 13632
Genzano di Roma RM 4 23970 37602
Nemi RM 6 1943 39545
Ariccia RM 6 19407 58952
Velletri RM 7 53303 112255
Albano Laziale RM 8 41715 153970
Aprilia LT 9 73446 227416
Castel Gandolfo RM 10 8997 236413
Rocca di Papa RM 11 17034 253447
Marino RM 12 43026 296473
Lariano RM 13 13432 309905
Grottaferrata RM 14 20327 330232
Cisterna di Latina LT 14 36868 367100
Ardea RM 14 49183 416283
Rocca Priora RM 15 11962 428245
Frascati RM 15 22087 450332
Monte Compatri RM 16 11978 462310
Pomezia RM 16 62966 525276
Monte Porzio Catone RM 17 8693 533969
Ciampino RM 17 38412 572381
Cori LT 18 11065 583446
Rocca Massima LT 19 1136 584582
Colonna RM 19 4287 588869
San Cesareo RM 19 15153 604022
Artena RM 20 14276 618298

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km W of Velletri (53303 inhabitants)
9 Km NE of Aprilia (73446 inhabitants)
16 Km E of Pomezia (62966 inhabitants)
25 Km N of Anzio (54211 inhabitants)
28 Km NW of Latina (125985 inhabitants)
31 Km SE of Roma (2864731 inhabitants)
34 Km S of Tivoli (56533 inhabitants)
37 Km S of Guidonia Montecelio (88673 inhabitants)
40 Km E of Fiumicino (78395 inhabitants)
88 Km SE of Civitavecchia (52991 inhabitants)
96 Km SW of L'Aquila (69753 inhabitants)
97 Km SE of Viterbo (67173 inhabitants)
99 Km S of Terni (111501 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 2.1 2020-12-18
17:25:26
41.6687 12.6958 9 2021-02-26
14:56:17
Bollettino Sismico Italiano INGV 86850711
Reviewed
Rev100
ML 2.1 2020-12-18
17:25:26
41.6612 12.7045 8 2020-12-18
17:44:41
Sala Sismica INGV-Roma 85525581
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-18 17:25:26 ± 0.11
Latitude 41.6687 ± 0.0054
Longitude 12.6958 ± 0.0072
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86850711

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 660
Semi-minor axis of confidence ellipse (meter) 523
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 241
Circular confidence region, given by single value of horizontal uncertainty (meter) 660.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 177
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.66550
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.4
Num. used stations 15
Type of magnitude ML
Reference to an origin 86850711
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-22 18:01:45

ML:2.1

Field Value
Value 2.1
Uncertainty 0.4
Num. used stations 18
Type of magnitude ML
Reference to an origin 85525581
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-18 17:44:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SCIAC.HHZ. 2020-12-18T17:27:16.54 3.0 undecidable manual Sn -0.23 0
IV.NDIM.HNZ. 2020-12-18T17:26:23.73 3.0 positive manual Pn 2 0
IV.NARO.HHZ. 2020-12-18T17:26:23.00 3.0 undecidable manual Sn -5.87 0
IT.PLTA.HNZ. 2020-12-18T17:26:18.03 3.0 undecidable manual Sg 0.83 0
IV.IMOL.HNZ. 2020-12-18T17:26:13.97 3.0 negative manual Pg 1.74 0
IV.IMTC.HHZ. 2020-12-18T17:26:05.47 3.0 undecidable manual S -2.17 0
IV.MNTT.EHZ. 2020-12-18T17:25:52.30 3.0 positive manual P -2.76 0
IV.PTQR.HHZ. 2020-12-18T17:25:48.29 0.3 undecidable manual S 56 70.1742 50 0.33 65
IV.GUAR.HHZ. 2020-12-18T17:25:43.68 0.6 undecidable manual S 75 52.9026 50 0.34 45
IV.GIUL.HHZ. 2020-12-18T17:25:42.29 0.6 undecidable manual S 105 47.9187 50 0.27 46
IV.LRP.EHZ. 2020-12-18T17:25:39.12 0.3 undecidable manual P 92 73.8705 50 -0.22 66
IV.TOLF.HHZ. 2020-12-18T17:25:39.36 0.6 undecidable manual P 308 72.2721 50 0.26 44
IV.PTQR.HHZ. 2020-12-18T17:25:38.53 0.1 undecidable manual P 56 70.1742 50 -0.24 88
IV.RCAV.EHZ. 2020-12-18T17:25:36.40 0.6 undecidable manual S 46 28.6491 107 -0.2 48
IV.GIUL.HHZ. 2020-12-18T17:25:35.11 0.1 undecidable manual P 105 47.9187 50 -0.23 92
IV.GUAR.HHZ. 2020-12-18T17:25:35.84 0.1 undecidable manual P 75 52.9026 50 -0.27 90
IV.MTCE.HHZ. 2020-12-18T17:25:33.83 0.6 undecidable manual P 6 39.4272 50 -0.21 47
IV.RCAV.EHZ. 2020-12-18T17:25:32.05 0.3 undecidable manual P 46 28.6491 107 -0.17 72
IV.LATB.EHZ. 2020-12-18T17:25:32.29 0.3 undecidable manual P 131 29.4483 106 -0.08 73
IV.SAMA.EHZ. 2020-12-18T17:25:32.14 0.6 undecidable manual S 325 15.0738 120 -0.12 50
IV.RMP.HHZ. 2020-12-18T17:25:32.58 0.6 undecidable manual S 3 15.873 119 0.07 50
IV.VIVA.HHZ. 2020-12-18T17:25:31.12 0.3 undecidable manual S 34 10.9779 128 0.05 76
IV.RDP.HHZ. 2020-12-18T17:25:30.80 0.3 undecidable manual S 7 10.2786 130 -0.08 76
IV.RMP.HHZ. 2020-12-18T17:25:30.25 0.3 undecidable manual P 3 15.873 119 0.4 70
IV.MA9.HHZ. 2020-12-18T17:25:30.68 0.3 undecidable manual S 345 11.5773 127 -0.57 67
IV.SAMA.EHZ. 2020-12-18T17:25:29.87 0.1 undecidable manual P 325 15.0738 120 0.16 99
IV.RDP.HHZ. 2020-12-18T17:25:29.22 0.1 undecidable manual P 7 10.2786 130 0.31 97
IV.VIVA.HHZ. 2020-12-18T17:25:29.31 0.1 undecidable manual P 34 10.9779 128 0.29 97
IV.LAV9.HNZ. 2020-12-18T17:25:29.15 0.3 undecidable manual S 14 0.999 173 -0.1 77
IV.LAV9.HNZ. 2020-12-18T17:25:28.19 0.1 undecidable manual P 14 0.999 173 0.22 100
IV.MA9.HHZ. 2020-12-18T17:25:28.99 0.3 undecidable manual P 345 11.5773 127 -0.14 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RDP.HHE. ML:2.4 0.0035221550000000003 0.32 AML other m 2020-12-18T17:25:31.10
IV.VIVA.HHN. ML:2.2 0.002075929 0.32 AML other m 2020-12-18T17:25:31.49
IV.VIVA.HHE. ML:2.5 0.004282731 0.7168 AML other m 2020-12-18T17:25:31.89
IV.RDP.HHN. ML:2.9 0.01053615 0.256 AML other m 2020-12-18T17:25:31.61
IV.RMP.HHE. ML:2.4 0.0024121085 0.32 AML other m 2020-12-18T17:25:33.30
IV.RMP.HHN. ML:2.7 0.0051582404999999994 0.1664 AML other m 2020-12-18T17:25:34.73
IV.GIUL.HHE. ML:1.8 0.0001652283 0.64 AML other m 2020-12-18T17:25:42.55
IV.GIUL.HHN. ML:1.6 0.00011043122 0.384 AML other m 2020-12-18T17:25:42.71
IV.GUAR.HHE. ML:2.1 0.0002893618 0.2816 AML other m 2020-12-18T17:25:44.30
IV.GUAR.HHN. ML:2.0 0.0002609782 0.2816 AML other m 2020-12-18T17:25:44.77
IV.PTQR.HHE. ML:1.8 0.00010509214499999999 1.4112 AML other m 2020-12-18T17:25:48.82
IV.PTQR.HHN. ML:2.2 0.0002718295 1.488 AML other m 2020-12-18T17:25:48.11
IV.LRP.EHE. ML:2.2 0.00023700635000000004 0.2816 AML other m 2020-12-18T17:25:50.43
IV.LRP.EHN. ML:1.4 0.000041695475000000006 0.2304 AML other m 2020-12-18T17:25:50.99
IV.TOLF.HHN. ML:1.7 0.00008355807000000001 0.32 AML other m 2020-12-18T17:25:51.82
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
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