Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 06-01-2021 and time 14:03:49 (UTC) in region 3 km S San Gemini (TR)

A magnitude ML 1.9 earthquake occured in region: 3 km S San Gemini (TR), on

  • 06-01-2021 14:03:49 (UTC)
  • 06-01-2021 15:03:49 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.59, 12.54 at 8 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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 3 5018 5018
Montecastrilli TR 8 5022 10040
Narni TR 8 19785 29825
Terni TR 9 111501 141326
Amelia TR 11 11897 153223
Acquasparta TR 11 4778 158001
Avigliano Umbro TR 12 2558 160559
Stroncone TR 14 4917 165476
Lugnano in Teverina TR 17 1494 166970
Montefranco TR 19 1276 168246
Penna in Teverina TR 19 1099 169345
Arrone TR 19 2763 172108
Otricoli TR 19 1869 173977
Orte VT 19 8923 182900
Giove TR 20 1928 184828

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km W of Terni (111501 inhabitants)
41 Km E of Viterbo (67173 inhabitants)
43 Km SW of Foligno (57155 inhabitants)
59 Km S of Perugia (166134 inhabitants)
67 Km N of Guidonia Montecelio (88673 inhabitants)
73 Km N of Tivoli (56533 inhabitants)
75 Km W of L'Aquila (69753 inhabitants)
78 Km N of Roma (2864731 inhabitants)
83 Km NE of Civitavecchia (52991 inhabitants)
94 Km N of Fiumicino (78395 inhabitants)
96 Km W of Teramo (54892 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.9 2021-01-06
14:03:49		 42.59 12.54 8 2021-01-06
14:13:51		 Sala Sismica INGV-Roma 86048011
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-06 14:03:49 ± 0.11
Latitude 42.59 ± 0.00
Longitude 12.54 ± 0.01
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86048011

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 580
Semi-minor axis of confidence ellipse (meter) 429
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 81
Circular confidence region, given by single value of horizontal uncertainty (meter) 580
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 89
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) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.03777
Epicentral distance of station farthest from the epicenter (degree) 0.69787
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 20
Type of magnitude ML
Reference to an origin 86048011
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-06 14:13:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-01-06T14:04:14.00 0.6 undecidable manual S 44 0.6979 50 0.52 40
IV.MMO1.EHZ. 2021-01-06T14:04:12.42 0.3 undecidable manual S 62 0.6538 50 0.24 64
IV.MURB.HHZ. 2021-01-06T14:04:12.96 0.3 undecidable manual S 359 0.6709 50 0.26 63
IV.FDMO.HHZ. 2021-01-06T14:04:10.68 1.0 undecidable manual S 42 0.5989 50 0.13 22
IV.MC2.EHZ. 2021-01-06T14:04:10.16 0.6 undecidable manual S 56 0.5729 50 0.37 42
IV.FIAM.HHN. 2021-01-06T14:04:08.99 0.3 undecidable manual S 127 0.5342 50 0.36 64
IV.CESI.HHZ. 2021-01-06T14:04:07.57 0.6 undecidable manual S 33 0.4919 50 0.19 44
IV.BARO.HNE. 2021-01-06T14:04:07.62 0.3 undecidable manual S 227 0.4982 50 0.04 69
IV.MGAB.HHZ. 2021-01-06T14:04:06.30 0.6 undecidable manual S 316 0.4497 50 0.17 45
IT.MMP1.HGE. 2021-01-06T14:04:04.11 0.6 undecidable manual S 156 0.375 50 0.2 45
IV.MURB.HHZ. 2021-01-06T14:04:03.77 0.1 undecidable manual P 359 0.6709 50 0.83 70
IV.LNSS.HHZ. 2021-01-06T14:04:03.17 0.6 undecidable manual S 88 0.3678 50 -0.53 42
IV.SRES.HHZ. 2021-01-06T14:04:03.34 0.6 undecidable manual S 184 0.3552 50 0.01 47
IV.CSP1.EHZ. 2021-01-06T14:04:02.90 0.6 positive manual P 44 0.6979 50 -0.49 40
IV.MMO1.EHZ. 2021-01-06T14:04:02.24 0.1 undecidable manual P 62 0.6538 50 -0.39 82
IV.FDMO.HHZ. 2021-01-06T14:04:01.06 0.1 undecidable manual P 42 0.5989 50 -0.63 77
IV.MC2.EHZ. 2021-01-06T14:04:01.28 0.6 undecidable manual P 56 0.5729 50 0.03 45
IV.FIAM.HHN. 2021-01-06T14:04:00.43 0.6 undecidable manual P 127 0.5342 50 -0.15 44
IV.MGAB.HHZ. 2021-01-06T14:03:59.04 1.0 positive manual P 316 0.4497 50 -0.1 23
IV.CESI.HHZ. 2021-01-06T14:03:59.56 0.1 undecidable manual P 33 0.4919 50 -0.31 87
IV.BARO.HNE. 2021-01-06T14:03:59.63 3.0 undecidable manual P 227 0.4982 50 -0.35 0
IT.MMP1.HGE. 2021-01-06T14:03:58.03 1.0 undecidable manual P 156 0.375 50 0.17 23
IV.MOMA.HHZ. 2021-01-06T14:03:57.92 0.3 undecidable manual S 6 0.2131 108 -0.31 69
IV.LNSS.HHZ. 2021-01-06T14:03:57.28 0.3 negative manual P 88 0.3678 50 -0.46 65
IV.SRES.HHZ. 2021-01-06T14:03:57.18 0.6 undecidable manual P 184 0.3552 50 -0.34 44
IV.ARRO.EHZ. 2021-01-06T14:03:56.63 0.3 undecidable manual S 94 0.1655 113 0.13 72
IV.MOMA.HHZ. 2021-01-06T14:03:54.48 0.1 negative manual P 6 0.2131 108 -0.1 96
IV.ARRO.EHZ. 2021-01-06T14:03:53.76 0.3 positive manual P 94 0.1655 113 0.18 71
IV.CESX.HHZ. 2021-01-06T14:03:52.93 0.3 undecidable manual S 63 0.0378 151 0.32 71
IV.CESX.HHZ. 2021-01-06T14:03:51.38 0.1 positive manual P 63 0.0378 151 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHE. ML:0 0.00068700305 0.16 AML other m 2021-01-06T14:03:57.57
IV.ARRO.EHN. ML:0 0.0006627262 0.256 AML other m 2021-01-06T14:03:57.86
IV.MOMA.HHE. ML:1.8 0.000417 0.18 AML other m 2021-01-06T14:03:59.37
IV.MOMA.HNE. ML:1.8 0.000372 0.18 AML other m 2021-01-06T14:03:59.47
IV.MOMA.HHN. ML:1.8 0.00042912895 0.3392 AML other m 2021-01-06T14:04:00.09
IV.MOMA.HNN. ML:1.9 0.0004635 0.68 AML other m 2021-01-06T14:04:00.10
IV.LNSS.HHN. ML:2 0.0003795 0.16 AML other m 2021-01-06T14:04:03.90
IV.LNSS.HHE. ML:2.1 0.0003975 0.12 AML other m 2021-01-06T14:04:04.95
IV.CESI.HHN. ML:1.8 0.000159 0.2 AML other m 2021-01-06T14:04:08.10
IV.CESI.HHE. ML:1.6 9.28E-5 0.68 AML other m 2021-01-06T14:04:09.99
IV.FDMO.HHE. ML:1.6 6.2574285E-5 0.2944 AML other m 2021-01-06T14:04:10.99
IV.FDMO.HHN. ML:1.5 5.387865E-5 0.1408 AML other m 2021-01-06T14:04:12.25
IV.CSP1.EHE. ML:2.3 0.000286 0.4 AML other m 2021-01-06T14:04:14.62
IV.CSP1.EHN. ML:2.2 0.00024041925 0.5376 AML other m 2021-01-06T14:04:14.71
IV.MURB.HHE. ML:0 0.0001973104 0.48 AML other m 2021-01-06T14:04:14.94
IV.MURB.HHN. ML:0 0.000124666965 0.2624 AML other m 2021-01-06T14:04:14.70
IV.CESX.HHE. ML:0 0.00127720585 0.4032 AML other m 2021-01-06T14:03:54.60
IV.CESX.HHN. ML:0 0.002195179 0.2048 AML other m 2021-01-06T14:03:53.32
IV.LNSS.HNE. ML:2.3 0.00069600815 12.8192 AML other m 2021-01-06T14:04:15.36
IV.LNSS.HNN. ML:2.2 0.000529841195 8.8704 AML other m 2021-01-06T14:04:14.63
IV.CESI.HNE. ML:1.9 0.0001695855 0.768 AML other m 2021-01-06T14:04:12.71
IV.CESI.HNN. ML:2 0.00023876545 0.6976 AML other m 2021-01-06T14:04:07.75
IV.MURB.HNE. ML:2.1 0.00020676925 3.7632 AML other m 2021-01-06T14:04:09.54
IV.MURB.HNN. ML:2 0.00016263675 0.7424 AML other m 2021-01-06T14:04:19.04
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download