Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 21-07-2021 and time 02:24:03 (Italy) in region 1 km SE Castiglione in Teverina (VT)

A magnitude ML 0.8 earthquake occured in region: 1 km SE Castiglione in Teverina (VT), on

  • 21-07-2021 00:24:03 (UTC)
  • 21-07-2021 02:24:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6400, 12.2150 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
Castiglione in Teverina VT 1 2329 2329
Baschi TR 4 2722 5051
Civitella d'Agliano VT 4 1640 6691
Montecchio TR 7 1676 8367
Guardea TR 7 1836 10203
Graffignano VT 7 2292 12495
Lubriano VT 9 909 13404
Alviano TR 9 1463 14867
Bagnoregio VT 10 3650 18517
Porano TR 11 1966 20483
Celleno VT 11 1355 21838
Lugnano in Teverina TR 12 1494 23332
Orvieto TR 12 20630 43962
Attigliano TR 15 2028 45990
Bomarzo VT 17 1805 47795
Giove TR 17 1928 49723
Avigliano Umbro TR 18 2558 52281
Bolsena VT 19 3991 56272
Amelia TR 19 11897 68169
Montefiascone VT 19 13432 81601
Vitorchiano VT 19 5233 86834
Penna in Teverina TR 20 1099 87933

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km NE of Viterbo (67173 inhabitants)
37 Km W of Terni (111501 inhabitants)
53 Km SW of Foligno (57155 inhabitants)
54 Km S of Perugia (166134 inhabitants)
70 Km NE of Civitavecchia (52991 inhabitants)
83 Km NW of Guidonia Montecelio (88673 inhabitants)
86 Km N of Roma (2864731 inhabitants)
89 Km NW of Tivoli (56533 inhabitants)
91 Km E of Grosseto (82087 inhabitants)
96 Km S of Arezzo (99543 inhabitants)
96 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 0.8 2021-07-21
00:24:03		 42.6397 12.2147 7 2021-12-29
11:12:17		 Bollettino Sismico Italiano INGV 93621061
Reviewed
Rev100 		ML 1.0 2021-07-21
00:24:03		 42.6492 12.2183 10 2021-07-21
00:36:42		 Sala Sismica INGV-Roma 93003031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-21 00:24:03 ± 0.1
Latitude 42.6397 ± 0.0045
Longitude 12.2147 ± 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 93621061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 397
Semi-minor axis of confidence ellipse (meter) 377
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 21
Circular confidence region, given by single value of horizontal uncertainty (meter) 400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 93
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.27519
Epicentral distance of station farthest from the epicenter (degree) 0.51801
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 93621061
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-08-03 15:13:16

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 93003031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-21 00:36:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASSB.HHN. 2021-07-21T00:24:22.23 0.3 undecidable manual S 39 57.498 50 0.17 70
TV.SF03.EHZ. 2021-07-21T00:24:19.21 0.6 undecidable manual S 293 46.7199 50 0.01 49
IV.ARRO.EHZ. 2021-07-21T00:24:18.95 0.3 undecidable manual S 98 45.5211 50 0.08 72
IV.MCIV.CHE. 2021-07-21T00:24:18.63 0.6 undecidable manual S 290 46.5201 50 -0.5 44
IV.BARO.HNN. 2021-07-21T00:24:18.73 0.3 undecidable manual S 197 45.4212 50 -0.13 72
IV.MGAB.HHZ. 2021-07-21T00:24:14.85 0.3 undecidable manual S 345 31.4463 103 0.26 71
IV.ASSB.HHN. 2021-07-21T00:24:13.96 0.1 undecidable manual P 39 57.498 50 -0.22 92
IV.CESX.HHZ. 2021-07-21T00:24:13.83 0.3 undecidable manual S 96 30.5472 103 -0.48 68
IV.SRES.HHZ. 2021-07-21T00:24:13.58 1.0 undecidable manual P 151 50.8158 50 0.43 22
IV.BARO.HNN. 2021-07-21T00:24:12.68 0.1 undecidable manual P 197 45.4212 50 0.35 91
IV.ARRO.EHZ. 2021-07-21T00:24:12.37 0.1 undecidable manual P 98 45.5211 50 0.04 97
IV.MCIV.CHE. 2021-07-21T00:24:12.43 0.1 undecidable manual P 290 46.5201 50 -0.06 97
TV.SF03.EHZ. 2021-07-21T00:24:12.49 1.0 undecidable manual P 293 46.7199 50 -0.04 24
IV.SACS.HHZ. 2021-07-21T00:24:10.29 0.1 undecidable manual P 313 34.0437 102 -0.09 98
IV.MGAB.HHZ. 2021-07-21T00:24:09.89 0.1 undecidable manual P 345 31.4463 103 0.02 100
IV.CESX.HHZ. 2021-07-21T00:24:09.92 0.3 undecidable manual P 96 30.5472 103 0.22 72
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHE. ML:0.5 0.00001370148 0.52 AML other m 2021-07-21T00:24:14.53
IV.SACS.HHN. ML:0.7 0.000019950000000000004 0.54 AML other m 2021-07-21T00:24:16.34
IV.SACS.HHE. ML:0.8 0.000022499999999999998 0.88 AML other m 2021-07-21T00:24:16.78
IV.MGAB.HHE. ML:1.0 0.000044943419999999995 0.52 AML other m 2021-07-21T00:24:15.34
IV.MGAB.HHN. ML:1.0 0.000049001575 0.44 AML other m 2021-07-21T00:24:15.23
IV.CESX.HHN. ML:0.5 0.000013825874999999999 0.2 AML other m 2021-07-21T00:24:14.07
IV.ARRO.EHN. ML:1.2 0.000047799999999999996 0.2 AML other m 2021-07-21T00:24:19.46
IV.ARRO.EHE. ML:1.1 0.00003585 0.22 AML other m 2021-07-21T00:24:19.91
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