Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 20-09-2021 and time 23:35:19 (Italy) in region 3 km NE Cerreto di Spoleto (PG)

A magnitude ML 0.7 earthquake occured in region: 3 km NE Cerreto di Spoleto (PG), on

  • 20-09-2021 21:35:19 (UTC)
  • 20-09-2021 23:35:19 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8400, 12.9380 at 11 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
Cerreto di Spoleto PG 3 1075 1075
Sellano PG 6 1079 2154
Preci PG 9 724 2878
Vallo di Nera PG 10 364 3242
Campello sul Clitunno PG 13 2442 5684
Norcia PG 14 4957 10641
Poggiodomo PG 14 117 10758
Sant'Anatolia di Narco PG 14 564 11322
Cascia PG 15 3217 14539
Trevi PG 16 8469 23008
Visso MC 16 1107 24115
Scheggino PG 17 461 24576
Monte Cavallo MC 18 145 24721
Castelsantangelo sul Nera MC 19 281 25002
Spoleto PG 20 38218 63220

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SE of Foligno (57155 inhabitants)
39 Km NE of Terni (111501 inhabitants)
54 Km SE of Perugia (166134 inhabitants)
66 Km W of Teramo (54892 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
83 Km NE of Viterbo (67173 inhabitants)
95 Km N of Guidonia Montecelio (88673 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
99 Km SW of Ancona (100861 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 0.7 2021-09-20
21:35:19		 42.8397 12.9383 11 2022-03-30
13:04:30		 Bollettino Sismico Italiano INGV 99779261
Reviewed
Rev100 		Md 1.5 2021-09-20
21:35:19		 42.8393 12.9378 11 2021-09-20
21:54:47		 Sala Sismica INGV-Roma 95677541
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-20 21:35:19 ± 0.03
Latitude 42.8397 ± 0.0018
Longitude 12.9383 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99779261

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 259
Semi-minor axis of confidence ellipse (meter) 117
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 269
Circular confidence region, given by single value of horizontal uncertainty (meter) 260.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 123
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.31836
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.1
Num. used stations 10
Type of magnitude ML
Reference to an origin 99779261
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-14 13:44:00

Md:1.5

Field Value
Value 1.5
Uncertainty 0.1
Num. used stations 7
Type of magnitude Md
Reference to an origin 95677541
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-20 21:54:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-09-20T21:35:32.01 0.3 undecidable manual S 38 35.3424 50 0.17 71
IV.ASSB.HHZ. 2021-09-20T21:35:30.83 0.3 undecidable manual S 315 31.9458 50 -0.1 72
IV.MML1.EHZ. 2021-09-20T21:35:30.66 0.6 undecidable manual S 5 30.5472 50 0.12 72
IV.LNSS.HHE. 2021-09-20T21:35:29.57 0.3 undecidable manual S 162 27.5502 50 -0.18 71
IV.CRTC.HHZ. 2021-09-20T21:35:29.11 3.0 positive manual P -0.03 0
IV.MC2.EHZ. 2021-09-20T21:35:28.43 0.3 undecidable manual S 69 21.867 50 0.19 72
IV.FDMO.HHZ. 2021-09-20T21:35:28.87 0.3 undecidable manual S 29 24.9528 50 -0.19 72
IV.MOMA.HHZ. 2021-09-20T21:35:27.22 3.0 undecidable manual P 0
IV.CESI.HHZ. 2021-09-20T21:35:27.24 0.3 undecidable manual S 352 18.5703 120 -0.05 75
IV.MML1.EHZ. 2021-09-20T21:35:26.00 0.1 undecidable manual P 5 30.5472 50 -0.02 98
IV.GAVE.EHN. 2021-09-20T21:35:26.75 0.3 undecidable manual S 192 16.7721 123 -0.01 75
IV.ASSB.HHZ. 2021-09-20T21:35:26.25 0.1 undecidable manual P 315 31.9458 50 0 74
IT.MTCL.HGE. 2021-09-20T21:35:26.98 0.6 undecidable manual S 16 17.7711 121 -0.1 74
IV.CSP1.EHZ. 2021-09-20T21:35:26.73 0.1 undecidable manual P 38 35.3424 50 -0.05 97
IV.LNSS.HHE. 2021-09-20T21:35:25.54 0.1 undecidable manual P 162 27.5502 50 -0.03 98
IV.NRCA.HNE. 2021-09-20T21:35:25.89 0.3 undecidable manual S 93 14.3745 127 -0.18 73
IV.FDMO.HHZ. 2021-09-20T21:35:25.13 0.1 undecidable manual P 29 24.9528 50 -0.04 99
IT.MTCL.HGE. 2021-09-20T21:35:24.03 0.3 undecidable manual P 16 17.7711 121 0.01 75
IV.CESI.HHZ. 2021-09-20T21:35:24.25 0.1 undecidable manual P 352 18.5703 120 0.1 98
IV.MC2.EHZ. 2021-09-20T21:35:24.74 0.1 undecidable manual P 69 21.867 50 0.05 99
IV.GAVE.EHN. 2021-09-20T21:35:24.03 0.1 undecidable manual P 192 16.7721 123 0.19 97
IV.NRCA.HNE. 2021-09-20T21:35:23.50 0.1 undecidable manual P 93 14.3745 127 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:0.6 0.000033094899999999994 0.0768 AML other m 2021-09-20T21:35:28.08
IV.CESI.HHN. ML:0.8 0.000050745365 0.256 AML other m 2021-09-20T21:35:27.43
IV.CESI.HNN. ML:0.8 0.000054921210999999995 0.0896 AML other m 2021-09-20T21:35:27.55
IV.CESI.HNE. ML:0.7 0.00003902315 0.1024 AML other m 2021-09-20T21:35:28.09
IV.FDMO.HHE. ML:0.6 0.000027278480000000002 0.1408 AML other m 2021-09-20T21:35:29.25
IV.FDMO.HHN. ML:0.4 0.000016279826500000002 0.1792 AML other m 2021-09-20T21:35:29.16
IV.ASSB.HHE. ML:0.5 0.00001336098 0.1152 AML other m 2021-09-20T21:35:32.24
IV.ASSB.HHN. ML:0.5 0.000013513495 0.0768 AML other m 2021-09-20T21:35:32.58
IV.CSP1.EHE. ML:0.8 0.00002314334 0.1408 AML other m 2021-09-20T21:35:33.91
IV.CSP1.EHN. ML:0.6 0.000016840015 0.1664 AML other m 2021-09-20T21:35:33.37
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