Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 20-10-2020 and time 19:40:04 (Italy) in region 4 km NE Cittaducale (RI)

A magnitude ML 1.6 earthquake occured in region: 4 km NE Cittaducale (RI), on

  • 20-10-2020 17:40:04 (UTC)
  • 20-10-2020 19:40:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.4180, 12.9820 at 7 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
Cittaducale RI 4 6828 6828
Castel Sant'Angelo RI 5 1308 8136
Borgo Velino RI 7 972 9108
Micigliano RI 7 127 9235
Antrodoco RI 8 2588 11823
Cantalice RI 9 2755 14578
Rieti RI 10 47698 62276
Concerviano RI 10 291 62567
Poggio Bustone RI 12 2055 64622
Belmonte in Sabina RI 13 636 65258
Rivodutri RI 15 1253 66511
Posta RI 15 694 67205
Petrella Salto RI 15 1197 68402
Leonessa RI 16 2435 70837
Longone Sabino RI 16 597 71434
Borbona RI 16 617 72051
Rocca Sinibalda RI 17 815 72866
Morro Reatino RI 17 373 73239
Contigliano RI 18 3783 77022
Greccio RI 18 1558 78580
Colli sul Velino RI 19 533 79113
Labro RI 19 374 79487
Monte San Giovanni in Sabina RI 19 714 80201
Torricella in Sabina RI 20 1342 81543
Varco Sabino RI 20 187 81730

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SE of Terni (111501 inhabitants)
35 Km W of L'Aquila (69753 inhabitants)
51 Km NE of Guidonia Montecelio (88673 inhabitants)
53 Km N of Tivoli (56533 inhabitants)
64 Km SE of Foligno (57155 inhabitants)
65 Km W of Teramo (54892 inhabitants)
71 Km NE of Roma (2864731 inhabitants)
72 Km E of Viterbo (67173 inhabitants)
83 Km N of Velletri (53303 inhabitants)
91 Km SE of Perugia (166134 inhabitants)
92 Km NE of Pomezia (62966 inhabitants)
94 Km NE of Fiumicino (78395 inhabitants)
96 Km N of Aprilia (73446 inhabitants)
96 Km W of Montesilvano (53738 inhabitants)
98 Km W of Chieti (51815 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 1.6 2020-10-20
17:40:04		 42.4182 12.9822 7 2021-02-26
14:56:11		 Bollettino Sismico Italiano INGV 85492791
Reviewed
Rev100 		ML 1.6 2020-10-20
17:40:04		 42.415 12.9867 10 2020-10-20
17:51:34		 Sala Sismica INGV-Roma 83961191
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-20 17:40:04 ± 0.08
Latitude 42.4182 ± 0.0036
Longitude 12.9822 ± 0.0049
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 85492791

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 409
Semi-minor axis of confidence ellipse (meter) 258
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 181
Circular confidence region, given by single value of horizontal uncertainty (meter) 410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 97
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.17986
Epicentral distance of station farthest from the epicenter (degree) 0.80759
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 18
Type of magnitude ML
Reference to an origin 85492791
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-12-17 12:19:12

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 18
Type of magnitude ML
Reference to an origin 83961191
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-20 17:51:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MGAB.HHZ. 2020-10-20T17:40:31.84 0.6 undecidable manual S 308 89.6436 50 0.1 47
IV.MF5.EHZ. 2020-10-20T17:40:28.01 0.6 undecidable manual S 31 74.2701 50 0.4 45
IV.ASSB.HHZ. 2020-10-20T17:40:27.86 0.6 undecidable manual S 339 74.0703 50 0.27 47
IV.MOMA.HHZ. 2020-10-20T17:40:22.41 0.3 undecidable manual S 322 54.4011 50 0.08 75
IV.MGAB.HHZ. 2020-10-20T17:40:20.74 0.3 undecidable manual P 308 89.6436 50 0.54 64
IV.NRCA.HHZ. 2020-10-20T17:40:20.13 0.3 undecidable manual S 13 47.3193 50 -0.31 73
IV.SRES.HHZ. 2020-10-20T17:40:19.67 0.3 undecidable manual S 243 43.623 50 0.22 75
IV.CESX.HHE. 2020-10-20T17:40:18.17 0.6 undecidable manual S 303 38.628 100 0.12 51
IV.ASSB.HHZ. 2020-10-20T17:40:17.50 0.3 undecidable manual P 339 74.0703 50 -0.3 69
IV.SMA1.EHZ. 2020-10-20T17:40:17.54 0.3 undecidable manual S 51 37.2294 101 -0.05 78
IV.T1299.HNN. 2020-10-20T17:40:17.05 0.3 undecidable manual S 46 34.3434 101 0.47 72
IV.MF5.EHZ. 2020-10-20T17:40:17.73 0.3 undecidable manual P 31 74.2701 50 -0.09 73
IV.GAVE.EHZ. 2020-10-20T17:40:15.26 0.3 undecidable manual S 347 31.2465 103 -0.28 75
IV.MOMA.HHZ. 2020-10-20T17:40:14.66 0.3 undecidable manual P 322 54.4011 50 -0.11 75
IV.ARRO.EHZ. 2020-10-20T17:40:13.84 0.3 undecidable manual S 315 25.1526 105 0.35 75
IV.NRCA.HHZ. 2020-10-20T17:40:13.14 0.3 undecidable manual P 13 47.3193 50 -0.53 69
IV.SRES.HHZ. 2020-10-20T17:40:13.24 0.3 undecidable manual P 243 43.623 50 0.14 76
IV.LNSS.HHZ. 2020-10-20T17:40:12.42 0.3 undecidable manual S 13 21.0678 108 0.3 76
IV.RM33.EHZ. 2020-10-20T17:40:12.61 0.3 undecidable manual S 62 21.5673 108 0.32 76
IV.CESX.HHE. 2020-10-20T17:40:11.88 0.3 undecidable manual P 303 38.628 100 -0.41 72
IV.FIAM.HHZ. 2020-10-20T17:40:11.66 0.3 undecidable manual S 146 19.9689 109 -0.12 79
IV.SMA1.EHZ. 2020-10-20T17:40:11.85 0.3 undecidable manual P 51 37.2294 101 -0.18 76
IV.T1299.HNN. 2020-10-20T17:40:11.04 0.3 undecidable manual P 46 34.3434 101 -0.41 73
IV.GAVE.EHZ. 2020-10-20T17:40:10.54 0.1 undecidable manual P 347 31.2465 103 -0.31 100
IV.ARRO.EHZ. 2020-10-20T17:40:09.61 0.3 undecidable manual P 315 25.1526 105 -0.05 80
IV.RM33.EHZ. 2020-10-20T17:40:09.12 0.3 undecidable manual P 62 21.5673 108 0.16 79
IV.FIAM.HHZ. 2020-10-20T17:40:08.77 0.3 undecidable manual P 146 19.9689 109 0.09 80
IV.LNSS.HHZ. 2020-10-20T17:40:08.88 0.3 undecidable manual P 13 21.0678 108 0.01 81
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.EHE. ML:1.5 0.00023 0.26 AML other m 2020-10-20T17:40:13.61
IV.LNSS.HHE. ML:1.6 0.00029049999999999996 1.22 AML other m 2020-10-20T17:40:13.36
IV.RM33.EHN. ML:1.4 0.0001975 0.36 AML other m 2020-10-20T17:40:14.25
IV.LNSS.HHN. ML:1.8 0.0004255 0.56 AML other m 2020-10-20T17:40:15.06
IV.ARRO.EHE. ML:1.4 0.00014199999999999998 0.74 AML other m 2020-10-20T17:40:15.13
IV.ARRO.EHN. ML:1.3 0.00013450000000000002 0.24 AML other m 2020-10-20T17:40:15.31
IV.GAVE.EHE. ML:1.7 0.00022549999999999998 0.7 AML other m 2020-10-20T17:40:15.45
IV.GAVE.EHN. ML:1.7 0.00023050000000000002 0.56 AML other m 2020-10-20T17:40:17.89
IV.SMA1.EHN. ML:1.4 0.00008675 0.64 AML other m 2020-10-20T17:40:21.16
IV.NRCA.HHN. ML:1.5 0.00008555 0.12 AML other m 2020-10-20T17:40:21.95
IV.NRCA.HHE. ML:1.5 0.00008824999999999999 1.42 AML other m 2020-10-20T17:40:23.08
IV.MOMA.HHN. ML:1.7 0.0001275 0.42 AML other m 2020-10-20T17:40:24.23
IV.MOMA.HHE. ML:1.7 0.00011599999999999999 0.24 AML other m 2020-10-20T17:40:24.15
IV.SMA1.EHE. ML:1.4 0.00010385 0.5 AML other m 2020-10-20T17:40:24.72
IV.ASSB.HHN. ML:1.5 0.0000523 0.42 AML other m 2020-10-20T17:40:29.36
IV.APEC.HHN. ML:1.6 0.000025755 0.2 AML other m 2020-10-20T17:40:29.55
IV.APEC.HHE. ML:1.7 0.0000302 0.5 AML other m 2020-10-20T17:40:30.59
IV.ASSB.HHE. ML:1.7 0.0000696 0.44 AML other m 2020-10-20T17:40:31.31
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