Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 23-01-2021 and time 05:44:12 (UTC) in region 4 km NE San Gemini (TR)

A magnitude ML 2.1 earthquake occured in region: 4 km NE San Gemini (TR), on

  • 23-01-2021 05:44:12 (UTC)
  • 23-01-2021 06:44:12 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.6330, 12.5850 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
San Gemini TR 4 5018 5018
Acquasparta TR 7 4778 9796
Montecastrilli TR 8 5022 14818
Terni TR 10 111501 126319
Avigliano Umbro TR 13 2558 128877
Narni TR 14 19785 148662
Montefranco TR 16 1276 149938
Arrone TR 16 2763 152701
Stroncone TR 16 4917 157618
Amelia TR 16 11897 169515
Massa Martana PG 17 3770 173285
Ferentillo TR 17 1913 175198
Spoleto PG 17 38218 213416

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km NW of Terni (111501 inhabitants)
37 Km S of Foligno (57155 inhabitants)
46 Km NE of Viterbo (67173 inhabitants)
55 Km S of Perugia (166134 inhabitants)
71 Km N of Guidonia Montecelio (88673 inhabitants)
74 Km W of L'Aquila (69753 inhabitants)
76 Km N of Tivoli (56533 inhabitants)
83 Km N of Roma (2864731 inhabitants)
89 Km NE of Civitavecchia (52991 inhabitants)
92 Km W of Teramo (54892 inhabitants)
100 Km N of Fiumicino (78395 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 2021-01-23
05:44:12		 42.6333 12.5847 7 2021-07-12
16:54:56		 Bollettino Sismico Italiano INGV 86784621
Reviewed
Rev100 		ML 2.2 2021-01-23
05:44:11		 42.598 12.5112 10 2021-01-23
06:21:19		 Sala Sismica INGV-Roma 86483121
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-23 05:44:12 ± 0.08
Latitude 42.6333 ± 0.0036
Longitude 12.5847 ± 0.0061
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 86784621

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 517
Semi-minor axis of confidence ellipse (meter) 257
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 80
Circular confidence region, given by single value of horizontal uncertainty (meter) 520.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 106
Number of associated phases, regardless of their use for origin computation 30
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.62143
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 16
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.1
Num. used stations 14
Type of magnitude ML
Reference to an origin 86483121
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-23 06:21:19

ML:2.1

Field Value
Value 2.1
Uncertainty 0.1
Num. used stations 14
Type of magnitude ML
Reference to an origin 86784621
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-05 15:34:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MMUR.HNZ. 2021-01-23T05:44:44.32 3.0 undecidable manual S 0.79 0
IV.FDMO.HHZ. 2021-01-23T05:44:32.20 0.6 undecidable manual S 42 60.5949 50 0.08 45
IV.MGAB.HHZ. 2021-01-23T05:44:30.22 0.6 undecidable manual S 309 49.4172 50 1.09 33
IV.NRCA.HHZ. 2021-01-23T05:44:29.08 0.6 undecidable manual S 63 48.5181 50 0.18 45
IV.CESI.HHZ. 2021-01-23T05:44:29.10 0.6 undecidable manual S 32 48.7179 50 0.14 45
IV.SRES.HHN. 2021-01-23T05:44:28.16 0.6 undecidable manual S 188 44.4222 50 0.36 44
IV.ASSB.HHZ. 2021-01-23T05:44:28.10 0.6 undecidable manual S 8 45.8208 50 -0.07 46
IT.FOPC.HGN. 2021-01-23T05:44:26.05 0.6 undecidable manual S 14 38.5281 100 -0.07 47
IV.LNSS.HHZ. 2021-01-23T05:44:25.55 0.6 undecidable manual S 95 37.3293 100 -0.17 46
IV.MTCE.HHZ. 2021-01-23T05:44:25.54 0.3 undecidable manual P 169 68.9754 50 0.41 62
IV.SACS.HHE. 2021-01-23T05:44:23.71 0.6 undecidable manual P 294 59.9955 50 -0.04 45
IV.FDMO.HHZ. 2021-01-23T05:44:23.52 0.3 undecidable manual P 42 60.5949 50 -0.32 64
IV.GAVE.EHN. 2021-01-23T05:44:22.65 0.6 undecidable manual S 75 26.0517 105 0.75 40
IV.MGAB.HHZ. 2021-01-23T05:44:21.78 0.1 undecidable manual P 309 49.4172 50 -0.34 87
IV.CESI.HHZ. 2021-01-23T05:44:21.66 0.3 undecidable manual P 32 48.7179 50 -0.36 65
IV.SRES.HHN. 2021-01-23T05:44:21.43 0.3 undecidable manual P 188 44.4222 50 0.08 70
IV.ASSB.HHZ. 2021-01-23T05:44:21.22 0.1 undecidable manual P 8 45.8208 50 -0.34 88
IT.MMP1.HGE. 2021-01-23T05:44:21.17 0.6 undecidable manual P 162 44.7219 50 -0.22 45
IV.NRCA.HHZ. 2021-01-23T05:44:21.47 0.3 undecidable manual P 63 48.5181 50 -0.51 63
IV.LNSS.HHZ. 2021-01-23T05:44:20.13 0.3 undecidable manual P 95 37.3293 100 -0.02 71
IT.FOPC.HGN. 2021-01-23T05:44:20.23 0.3 undecidable manual P 14 38.5281 100 -0.15 69
IV.MOMA.HHZ. 2021-01-23T05:44:19.87 0.6 undecidable manual S 356 18.9699 110 0.34 46
IT.GNU.HGE. 2021-01-23T05:44:19.93 0.6 undecidable manual S 356 18.9699 110 0.41 45
IV.ARRO.EHZ. 2021-01-23T05:44:18.63 0.6 undecidable manual S 112 15.9729 113 0.07 49
IV.GAVE.EHN. 2021-01-23T05:44:17.89 0.3 undecidable manual P 75 26.0517 105 -0.05 72
IT.GNU.HGE. 2021-01-23T05:44:16.65 0.3 undecidable manual P 356 18.9699 110 0.08 73
IV.ARRO.EHZ. 2021-01-23T05:44:16.40 0.3 undecidable manual P 112 15.9729 113 0.38 69
IV.MOMA.HHZ. 2021-01-23T05:44:16.64 0.1 undecidable manual P 356 18.9699 110 0.07 97
IV.CESX.HHZ. 2021-01-23T05:44:14.58 0.6 undecidable manual S 176 2.7972 158 -0.51 45
IV.CESX.HHZ. 2021-01-23T05:44:13.95 0.1 positive manual P 176 2.7972 158 -0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HNN. ML:2.2 0.0014449999999999999 1.16 AML other m 2021-01-23T05:44:20.78
IV.MOMA.HHN. ML:2.3 0.0016 1.16 AML other m 2021-01-23T05:44:20.78
IV.ARRO.EHN. ML:2.0 0.00107 1.1 AML other m 2021-01-23T05:44:21.06
IV.MOMA.HNE. ML:2.2 0.0013700000000000001 0.6 AML other m 2021-01-23T05:44:21.61
IV.MOMA.HHE. ML:2.2 0.00147 0.6 AML other m 2021-01-23T05:44:21.61
IV.ARRO.EHE. ML:2.1 0.001285 0.86 AML other m 2021-01-23T05:44:22.14
IV.LNSS.HHE. ML:2.2 0.0006115 0.26 AML other m 2021-01-23T05:44:28.13
IV.LNSS.HHN. ML:2.2 0.000571 1.6 AML other m 2021-01-23T05:44:29.96
IV.NRCA.HHE. ML:2.1 0.000324 0.7 AML other m 2021-01-23T05:44:30.31
IV.NRCA.HHN. ML:2.0 0.00029749999999999997 0.12 AML other m 2021-01-23T05:44:30.88
IV.ASSB.HHE. ML:2.0 0.0002845 0.38 AML other m 2021-01-23T05:44:30.83
IV.ASSB.HHN. ML:1.9 0.000258 1.5 AML other m 2021-01-23T05:44:33.85
IV.FDMO.HHE. ML:2.2 0.00034250000000000003 0.24 AML other m 2021-01-23T05:44:33.50
IV.FDMO.HHN. ML:2.0 0.00021799999999999996 0.16 AML other m 2021-01-23T05:44:33.96
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