Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 12-10-2021 and time 23:31:35 (UTC) in region 3 km N Cittaducale (RI)

A magnitude ML 1.8 earthquake occured in region: 3 km N Cittaducale (RI), on

  • 12-10-2021 23:31:35 (UTC)
  • 13-10-2021 01:31:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.4100, 12.9410 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
Cittaducale RI 3 6828 6828
Rieti RI 6 47698 54526
Cantalice RI 7 2755 57281
Castel Sant'Angelo RI 8 1308 58589
Borgo Velino RI 10 972 59561
Concerviano RI 10 291 59852
Micigliano RI 11 127 59979
Belmonte in Sabina RI 11 636 60615
Poggio Bustone RI 11 2055 62670
Antrodoco RI 12 2588 65258
Rivodutri RI 14 1253 66511
Contigliano RI 14 3783 70294
Greccio RI 15 1558 71852
Rocca Sinibalda RI 15 815 72667
Longone Sabino RI 15 597 73264
Morro Reatino RI 16 373 73637
Monte San Giovanni in Sabina RI 16 714 74351
Petrella Salto RI 17 1197 75548
Colli sul Velino RI 17 533 76081
Leonessa RI 17 2435 78516
Labro RI 17 374 78890
Torricella in Sabina RI 18 1342 80232
Montenero Sabino RI 18 299 80531
Posta RI 18 694 81225
Poggio San Lorenzo RI 19 589 81814
Borbona RI 20 617 82431
Varco Sabino RI 20 187 82618

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SE of Terni (111501 inhabitants)
38 Km W of L'Aquila (69753 inhabitants)
49 Km NE of Guidonia Montecelio (88673 inhabitants)
51 Km N of Tivoli (56533 inhabitants)
64 Km SE of Foligno (57155 inhabitants)
69 Km W of Teramo (54892 inhabitants)
69 Km E of Viterbo (67173 inhabitants)
69 Km NE of Roma (2864731 inhabitants)
82 Km N of Velletri (53303 inhabitants)
90 Km SE of Perugia (166134 inhabitants)
90 Km NE of Pomezia (62966 inhabitants)
92 Km NE of Fiumicino (78395 inhabitants)
94 Km N of Aprilia (73446 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 1.8 2021-10-12
23:31:35		 42.4098 12.9413 8 2022-03-30
13:04:29		 Bollettino Sismico Italiano INGV 99688831
Reviewed
Rev100 		ML 1.8 2021-10-12
23:31:34		 42.3657 12.9197 8 2021-10-13
01:13:43		 Sala Sismica INGV-Roma 96483351
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-12 23:31:35 ± 0.09
Latitude 42.4098 ± 0.0036
Longitude 12.9413 ± 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 99688831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 407
Semi-minor axis of confidence ellipse (meter) 270
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 62
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) 105
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.19245
Epicentral distance of station farthest from the epicenter (degree) 0.70867
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.5
Num. used stations 30
Type of magnitude ML
Reference to an origin 96483351
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-13 01:13:43

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 30
Type of magnitude ML
Reference to an origin 99688831
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-12 11:39:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-10-12T23:31:59.70 0.6 undecidable manual S 16 78.6657 50 0.5 42
IV.FDMO.HHZ. 2021-10-12T23:31:57.30 0.6 undecidable manual S 10 70.4739 50 0.26 45
IV.MMO1.EHZ. 2021-10-12T23:31:55.10 0.3 undecidable manual S 30 62.7927 50 0.14 70
IV.MC2.EHZ. 2021-10-12T23:31:54.40 0.3 undecidable manual S 20 59.1963 50 0.38 67
IV.NRCA.HHZ. 2021-10-12T23:31:51.10 0.3 undecidable manual S 17 49.1175 50 -0.21 70
IV.CSP1.EHZ. 2021-10-12T23:31:49.04 0.3 undecidable manual P 16 78.6657 50 0.04 69
IV.SRES.HHZ. 2021-10-12T23:31:49.40 0.6 undecidable manual S 242 40.2264 50 0.44 45
IV.SMA1.EHZ. 2021-10-12T23:31:48.90 0.6 undecidable manual S 53 40.4262 50 -0.12 49
IV.MF5.EHZ. 2021-10-12T23:31:48.96 0.1 undecidable manual P 33 76.7676 50 0.25 88
IV.CESX.HHZ. 2021-10-12T23:31:48.20 0.6 undecidable manual S 307 36.4413 50 0.27 47
MN.AQU.HNN. 2021-10-12T23:31:48.80 0.6 undecidable manual S 99 38.5281 50 0.31 47
IV.FDMO.HHZ. 2021-10-12T23:31:47.32 0.3 undecidable manual P 10 70.4739 50 -0.43 65
IV.MMO1.EHZ. 2021-10-12T23:31:46.23 0.1 undecidable manual P 30 62.7927 50 -0.32 89
IV.GAVE.EHZ. 2021-10-12T23:31:45.90 0.3 undecidable manual S 353 31.5462 104 -0.45 69
IV.MC2.EHZ. 2021-10-12T23:31:45.79 0.1 undecidable manual P 20 59.1963 50 -0.21 92
IV.RM33.EHZ. 2021-10-12T23:31:44.50 0.3 undecidable manual S 64 24.9528 108 0.38 71
IV.NRCA.HHZ. 2021-10-12T23:31:44.02 0.1 undecidable manual P 17 49.1175 50 -0.42 90
IV.ARRO.EHZ. 2021-10-12T23:31:44.00 0.3 undecidable manual S 323 23.6541 108 0.29 72
IV.SMA1.EHZ. 2021-10-12T23:31:43.03 0.1 undecidable manual P 53 40.4262 50 -0.08 98
IV.SRES.HHZ. 2021-10-12T23:31:43.46 0.1 undecidable manual P 242 40.2264 50 0.38 92
IV.LNSS.HHZ. 2021-10-12T23:31:43.80 0.3 undecidable manual S 21 22.8549 109 0.34 72
MN.AQU.HNN. 2021-10-12T23:31:42.48 0.1 undecidable manual P 99 38.5281 50 -0.34 93
IV.CESX.HHZ. 2021-10-12T23:31:42.17 0.1 undecidable manual P 307 36.4413 50 -0.32 94
IV.FIAM.HNN. 2021-10-12T23:31:42.80 0.3 undecidable manual S 137 21.3675 110 -0.16 75
IV.GAVE.EHZ. 2021-10-12T23:31:41.38 0.1 undecidable manual P 353 31.5462 104 -0.19 97
IV.LNSS.HHZ. 2021-10-12T23:31:40.03 0.1 undecidable manual P 21 22.8549 109 0.12 100
IV.RM33.EHZ. 2021-10-12T23:31:40.49 0.1 positive manual P 64 24.9528 108 0.2 98
IV.ARRO.EHZ. 2021-10-12T23:31:39.93 0.3 undecidable manual P 323 23.6541 108 -0.12 75
IV.FIAM.HNN. 2021-10-12T23:31:39.63 0.3 undecidable manual P 137 21.3675 110 0.02 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHN. ML:0.0 0.0001898448 0.2048 AML other m 2021-10-12T23:31:44.38
IV.LNSS.HHE. ML:0.0 0.00036899420000000005 0.2304 AML other m 2021-10-12T23:31:44.49
IV.RM33.HNN. ML:0.0 0.000352 0.3 AML other m 2021-10-12T23:31:45.04
IV.RM33.EHN. ML:0.0 0.0003228878 0.32 AML other m 2021-10-12T23:31:45.03
IV.RM33.HNE. ML:0.0 0.00036613075000000003 0.2304 AML other m 2021-10-12T23:31:45.42
IV.RM33.EHE. ML:0.0 0.00035972715 0.3456 AML other m 2021-10-12T23:31:46.80
IV.GAVE.EHE. ML:0.0 0.0004715758 0.192 AML other m 2021-10-12T23:31:46.67
IV.ARRO.EHE. ML:0.0 0.0002721556 0.256 AML other m 2021-10-12T23:31:47.03
IV.LNSS.HHN. ML:0.0 0.00030788865 0.1664 AML other m 2021-10-12T23:31:45.66
IV.GAVE.EHN. ML:0.0 0.0005097297 0.1792 AML other m 2021-10-12T23:31:47.92
IV.CESX.HHN. ML:0.0 0.00008317313 0.256 AML other m 2021-10-12T23:31:51.04
IV.SRES.HHE. ML:0.0 0.000047119879999999994 0.256 AML other m 2021-10-12T23:31:50.77
IV.CESX.HHE. ML:0.0 0.00006842983499999999 0.32 AML other m 2021-10-12T23:31:51.17
IV.NRCA.HHN. ML:0.0 0.000083975615 0.1024 AML other m 2021-10-12T23:31:52.36
IV.NRCA.HHE. ML:0.0 0.00013045285 0.192 AML other m 2021-10-12T23:31:52.62
IV.SRES.HHN. ML:0.0 0.00004696623 0.5376 AML other m 2021-10-12T23:31:53.37
IV.SMA1.EHN. ML:0.0 0.00015949999999999997 1.46 AML other m 2021-10-12T23:31:53.88
IV.SMA1.EHE. ML:0.0 0.00013003144999999998 0.5504 AML other m 2021-10-12T23:31:53.76
IV.FDMO.HHN. ML:0.0 0.000044365865 0.1408 AML other m 2021-10-12T23:31:58.87
IV.FDMO.HHE. ML:0.0 0.000044776789999999994 0.1792 AML other m 2021-10-12T23:31:59.21
IV.MSSA.HHN. ML:3.1 0.000079871945 0.0512 AML other m 2021-10-12T23:32:12.09
IV.MSSA.HHE. ML:3.1 0.00008250008 0.0896 AML other m 2021-10-12T23:32:12.35
IV.LNSS.HNE. ML:0.0 0.0003645338 0.2304 AML other m 2021-10-12T23:31:44.49
IV.LNSS.HNN. ML:0.0 0.00028579915 0.1536 AML other m 2021-10-12T23:31:45.74
IV.GAVE.HNE. ML:0.0 0.00042840205 0.192 AML other m 2021-10-12T23:31:46.67
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