Earthquake with magnitude of ML 1.8 on date 21-01-2021 and time 20:59:54 (Italy) in region 7 km N Calvi dell'Umbria (TR)

A magnitude ML 1.8 earthquake occured in region: 7 km N Calvi dell'Umbria (TR), on

  • 21-01-2021 19:59:54 (UTC)
  • 21-01-2021 20:59:54 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.47, 12.58 at 9 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Calvi dell'Umbria TR 7 1856 1856
Configni RI 7 633 2489
Narni TR 8 19785 22274
Stroncone TR 8 4917 27191
Otricoli TR 9 1869 29060
Vacone RI 10 256 29316
Montebuono RI 11 883 30199
Cottanello RI 11 563 30762
Tarano RI 12 1444 32206
Terni TR 12 111501 143707
Montasola RI 12 395 144102
Torri in Sabina RI 14 1256 145358
Magliano Sabina RI 14 3774 149132
Collevecchio RI 15 1577 150709
Orte VT 15 8923 159632
Greccio RI 16 1558 161190
Casperia RI 16 1246 162436
Selci RI 17 1106 163542
San Gemini TR 17 5018 168560
Amelia TR 17 11897 180457
Contigliano RI 17 3783 184240
Gallese VT 17 2849 187089
Colli sul Velino RI 17 533 187622
Penna in Teverina TR 18 1099 188721
Cantalupo in Sabina RI 18 1685 190406
Stimigliano RI 19 2328 192734
Forano RI 19 3179 195913
Roccantica RI 19 563 196476
Vasanello VT 19 4068 200544
Labro RI 20 374 200918

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km SW of Terni (111501 inhabitants)
39 Km E of Viterbo (67173 inhabitants)
53 Km N of Guidonia Montecelio (88673 inhabitants)
56 Km S of Foligno (57155 inhabitants)
59 Km NW of Tivoli (56533 inhabitants)
64 Km N of Roma (2864731 inhabitants)
69 Km W of L'Aquila (69753 inhabitants)
73 Km S of Perugia (166134 inhabitants)
77 Km NE of Civitavecchia (52991 inhabitants)
82 Km NE of Fiumicino (78395 inhabitants)
88 Km N of Velletri (53303 inhabitants)
89 Km N of Pomezia (62966 inhabitants)
95 Km W of Teramo (54892 inhabitants)
97 Km N of Aprilia (73446 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 1.8 2021-01-21
19:59:54
42.47 12.58 9 2021-01-21
20:06:43
Sala Sismica INGV-Roma 86439391
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-21 19:59:54 ± 0.07
Latitude 42.47 ± 0.00
Longitude 12.58 ± 0.01
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86439391

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 520
Semi-minor axis of confidence ellipse (meter) 209
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 109
Circular confidence region, given by single value of horizontal uncertainty (meter) 520
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.14299
Epicentral distance of station farthest from the epicenter (degree) 0.68259
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 86439391
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-21 20:06:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.LNSS.HHZ. 2021-01-21T20:00:08.34 0.6 undecidable manual S 68 0.3687 50 -0.04 52
IV.SACS.HHE. 2021-01-21T20:00:07.07 1.0 undecidable manual P 308 0.6214 50 0.21 24
IV.FDMO.HHZ. 2021-01-21T20:00:07.80 0.6 positive manual P 33 0.6826 50 -0.12 48
IV.GAVE.EHZ. 2021-01-21T20:00:07.48 0.6 undecidable manual S 46 0.3256 50 0.36 49
IV.SMA1.EHZ. 2021-01-21T20:00:06.19 0.6 negative manual P 73 0.5837 50 -0.02 50
IV.MGAB.HHZ. 2021-01-21T20:00:06.07 0.6 positive manual P 323 0.5612 50 0.23 48
IV.CESI.HHZ. 2021-01-21T20:00:06.42 0.1 negative manual P 24 0.5909 50 0.09 98
IV.NRCA.HHZ. 2021-01-21T20:00:05.27 0.3 positive manual P 47 0.5405 50 -0.2 73
IT.MMP1.HGZ. 2021-01-21T20:00:05.18 1.0 undecidable manual S 149 0.2518 108 0.43 25
IV.RM33.EHZ. 2021-01-21T20:00:04.10 0.6 undecidable manual P 85 0.473 50 -0.22 49
IV.BARO.EHE. 2021-01-21T20:00:04.14 1.0 undecidable manual P 241 0.4443 50 0.31 24
IV.SRES.HHZ. 2021-01-21T20:00:04.03 0.6 undecidable manual S 192 0.2338 109 -0.08 53
IV.FIAM.HHZ. 2021-01-21T20:00:03.87 0.6 negative manual P 116 0.4461 50 0 52
IV.GAVE.EHZ. 2021-01-21T20:00:02.14 0.6 positive manual P 46 0.3256 50 0.33 49
IV.ARRO.EHZ. 2021-01-21T20:00:02.47 0.6 undecidable manual S 51 0.1799 114 0.28 51
IV.LNSS.HHZ. 2021-01-21T20:00:02.31 0.1 negative manual P 68 0.3687 50 -0.23 100
IV.MOMA.HNZ. 2021-01-21T20:00:01.70 0.6 undecidable manual P 359 0.3381 50 -0.31 49
IV.SRES.HHZ. 2021-01-21T20:00:00.05 1.0 positive manual P 192 0.2338 109 -0.03 27
IT.MMP1.HGZ. 2021-01-21T20:00:00.40 1.0 undecidable manual P 149 0.2518 108 -0.05 27
IV.CESX.HHZ. 2021-01-21T20:00:00.72 1.0 undecidable manual S 3 0.143 120 -0.19 26
IV.CESX.HHZ. 2021-01-21T19:59:58.09 1.0 undecidable manual P 3 0.143 120 -0.13 27
IV.ARRO.EHZ. 2021-01-21T19:59:58.88 0.3 positive manual P 51 0.1799 114 -0.08 80
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHE. ML:1.8 0.000454 0.82 AML other m 2021-01-21T20:00:03.52
IV.ARRO.EHN. ML:1.9 0.000668 1.38 AML other m 2021-01-21T20:00:03.85
IV.CESX.HHE. ML:1.8 0.0005675 1.56 AML other m 2021-01-21T20:00:04.04
IV.SRES.HHE. ML:1.5 0.0001855 0.42 AML other m 2021-01-21T20:00:05.14
IV.SRES.HHN. ML:1.5 0.000174 0.36 AML other m 2021-01-21T20:00:07.23
IV.CESX.HHN. ML:1.7 0.000508 0.92 AML other m 2021-01-21T20:00:08.83
IV.LNSS.HHN. ML:2.1 0.0004335 0.68 AML other m 2021-01-21T20:00:09.73
IV.LNSS.HHE. ML:2 0.0003135 0.54 AML other m 2021-01-21T20:00:10.45
IV.GAVE.EHE. ML:1.9 0.000293 1.54 AML other m 2021-01-21T20:00:10.84
IV.GAVE.EHN. ML:1.8 0.0002505 0.78 AML other m 2021-01-21T20:00:11.72
IV.RM33.EHE. ML:1.8 0.000163 0.32 AML other m 2021-01-21T20:00:14.75
IV.NRCA.HHE. ML:1.9 0.000157 0.52 AML other m 2021-01-21T20:00:14.98
IV.MGAB.HHN. ML:1.7 0.00010365 0.18 AML other m 2021-01-21T20:00:15.81
IV.SMA1.EHE. ML:2 0.000204 0.28 AML other m 2021-01-21T20:00:15.85
IV.CESI.HHN. ML:1.8 0.000127 1.18 AML other m 2021-01-21T20:00:16.08
IV.MGAB.HHE. ML:1.7 0.0001036 1.68 AML other m 2021-01-21T20:00:16.96
IV.RM33.EHN. ML:1.7 0.000123 0.24 AML other m 2021-01-21T20:00:17.29
IV.NRCA.HHN. ML:1.8 0.0001175 0.14 AML other m 2021-01-21T20:00:17.46
IV.SMA1.EHN. ML:2 0.000166 0.3 AML other m 2021-01-21T20:00:17.59
IV.FIAM.HHE. ML:1.4 6.74E-5 1.4 AML other m 2021-01-21T20:00:17.20
IV.FIAM.HHN. ML:1.5 7.88E-5 0.58 AML other m 2021-01-21T20:00:18.52
IV.CESI.HHE. ML:1.7 8.435E-5 0.36 AML other m 2021-01-21T20:00:19.82
IV.FDMO.HHN. ML:1.6 6.215E-5 0.42 AML other m 2021-01-21T20:00:23.78
IV.FDMO.HHE. ML:1.8 9.325E-5 0.28 AML other m 2021-01-21T20:00:23.80
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