Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 28-09-2021 and time 22:17:08 (Italy) in region 4 km SW Castel Ritaldi (PG)

A magnitude ML 1.4 earthquake occured in region: 4 km SW Castel Ritaldi (PG), on

  • 28-09-2021 20:17:08 (UTC)
  • 28-09-2021 22:17:08 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8050, 12.6390 at 8 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
Castel Ritaldi PG 4 3278 3278
Giano dell'Umbria PG 6 3846 7124
Massa Martana PG 10 3770 10894
Montefalco PG 10 5679 16573
Spoleto PG 11 38218 54791
Campello sul Clitunno PG 12 2442 57233
Trevi PG 12 8469 65702
Gualdo Cattaneo PG 14 6155 71857
Bevagna PG 15 5081 76938
Acquasparta TR 15 4778 81716
Foligno PG 18 57155 138871
Sant'Anatolia di Narco PG 18 564 139435
Vallo di Nera PG 19 364 139799
Scheggino PG 19 461 140260
Todi PG 19 16851 157111
Collazzone PG 19 3473 160584

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km SW of Foligno (57155 inhabitants)
27 Km N of Terni (111501 inhabitants)
39 Km SE of Perugia (166134 inhabitants)
61 Km NE of Viterbo (67173 inhabitants)
80 Km NW of L'Aquila (69753 inhabitants)
89 Km W of Teramo (54892 inhabitants)
90 Km N of Guidonia Montecelio (88673 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
96 Km SE of Arezzo (99543 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 1.4 2021-09-28
20:17:08		 42.805 12.6387 8 2022-03-30
13:04:11		 Bollettino Sismico Italiano INGV 96502761
Reviewed
Rev100 		ML 1.4 2021-09-28
20:17:08		 42.8087 12.6387 7 2021-09-28
20:52:51		 Sala Sismica INGV-Roma 96008101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-28 20:17:08 ± 0.06
Latitude 42.8050 ± 0.0027
Longitude 12.6387 ± 0.0061
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96502761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 504
Semi-minor axis of confidence ellipse (meter) 275
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 273
Circular confidence region, given by single value of horizontal uncertainty (meter) 500.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 34
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.62323
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 22
Type of magnitude ML
Reference to an origin 96502761
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-13 13:37:05

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 22
Type of magnitude ML
Reference to an origin 96008101
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-28 20:52:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-09-28T20:17:30.89 0.3 undecidable manual S 33 69.1752 50 0.61 59
IV.RSM2.HHZ. 2021-09-28T20:17:28.77 3.0 negative manual P -1.47 0
IV.SMA1.EHZ. 2021-09-28T20:17:28.40 0.6 undecidable manual S 109 59.9955 50 0.58 40
IV.RM33.EHZ. 2021-09-28T20:17:27.32 0.6 undecidable manual S 125 57.2982 50 0.21 44
IV.MMO1.EHZ. 2021-09-28T20:17:26.80 0.6 undecidable manual S 79 56.8986 50 -0.21 44
IV.CSP1.EHZ. 2021-09-28T20:17:26.93 0.6 undecidable manual S 55 55.8996 50 0.2 44
IV.MC2.EHZ. 2021-09-28T20:17:24.35 0.6 undecidable manual S 75 46.3203 50 0.19 45
IV.FDMO.HHZ. 2021-09-28T20:17:23.28 0.6 undecidable manual S 55 44.622 50 -0.43 43
IV.MML1.EHZ. 2021-09-28T20:17:23.14 0.6 undecidable manual S 38 43.623 50 -0.31 44
IV.NRCA.HHZ. 2021-09-28T20:17:22.03 0.6 undecidable manual S 85 38.8278 50 -0.14 46
IV.EL6.EHZ. 2021-09-28T20:17:21.13 0.6 positive manual P 33 69.1752 50 0.01 45
IV.RM33.EHZ. 2021-09-28T20:17:19.26 0.1 undecidable manual P 125 57.2982 50 -0.03 92
IV.CESI.HHZ. 2021-09-28T20:17:19.32 0.3 undecidable manual S 44 30.9468 104 -0.34 68
IV.MMO1.EHZ. 2021-09-28T20:17:19.29 0.6 negative manual P 79 56.8986 50 0.06 46
IV.SMA1.EHZ. 2021-09-28T20:17:19.66 0.1 undecidable manual P 109 59.9955 50 -0.04 91
IV.ARRO.EHZ. 2021-09-28T20:17:18.54 0.6 undecidable manual S 157 27.1506 106 0.17 47
IV.ASSB.HHZ. 2021-09-28T20:17:18.08 0.3 undecidable manual S 4 26.4513 106 -0.06 48
IV.CSP1.EHZ. 2021-09-28T20:17:18.92 0.6 positive manual P 55 55.8996 50 -0.14 45
IV.GAVE.EHZ. 2021-09-28T20:17:17.51 0.6 undecidable manual S 121 24.2535 108 0.08 48
IV.MC2.EHZ. 2021-09-28T20:17:17.31 1.0 undecidable manual P 75 46.3203 50 -0.27 22
IV.MML1.EHZ. 2021-09-28T20:17:16.77 1.0 negative manual P 38 43.623 50 -0.4 22
IV.CESX.HHZ. 2021-09-28T20:17:16.53 0.6 undecidable manual S 191 22.1556 109 -0.21 47
IV.FDMO.HHZ. 2021-09-28T20:17:16.94 1.0 negative manual P 55 44.622 50 -0.38 22
IV.NRCA.HHZ. 2021-09-28T20:17:16.15 0.1 negative manual P 85 38.8278 50 -0.29 90
IT.FOPC.HGN. 2021-09-28T20:17:15.96 0.1 undecidable manual S 16 18.9699 112 0.26 94
IV.ASSB.HHZ. 2021-09-28T20:17:14.05 0.6 positive manual P 4 26.4513 106 -0.06 48
IV.ARRO.EHZ. 2021-09-28T20:17:14.52 0.6 positive manual P 157 27.1506 106 0.28 46
IV.CESI.HHZ. 2021-09-28T20:17:14.80 0.1 undecidable manual P 44 30.9468 104 -0.19 93
IV.CESX.HHZ. 2021-09-28T20:17:13.23 0.3 positive manual P 191 22.1556 109 -0.07 73
IT.FOPC.HGN. 2021-09-28T20:17:13.03 0.1 undecidable manual P 16 18.9699 112 0.33 92
IV.GAVE.EHZ. 2021-09-28T20:17:13.72 0.6 positive manual P 121 24.2535 108 0.02 49
IV.MOMA.HHZ. 2021-09-28T20:17:11.68 0.6 undecidable manual S 269 5.5944 144 -0.2 49
IT.GNU.HGE. 2021-09-28T20:17:11.82 0.1 undecidable manual S 269 5.5944 144 -0.06 100
IT.GNU.HGE. 2021-09-28T20:17:10.63 0.1 undecidable manual P 269 5.5944 144 0.14 98
IV.MOMA.HHZ. 2021-09-28T20:17:10.59 0.1 undecidable manual P 269 5.5944 144 0.1 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHN. ML:1.8 0.00044399999999999995 0.34 AML other m 2021-09-28T20:17:18.33
IV.ASSB.HHN. ML:1.6 0.00021700000000000002 0.18 AML other m 2021-09-28T20:17:18.38
IV.ASSB.HHE. ML:1.5 0.0001725 0.32 AML other m 2021-09-28T20:17:18.44
IV.GAVE.EHN. ML:1.4 0.0001685 1.82 AML other m 2021-09-28T20:17:19.02
IV.GAVE.EHE. ML:1.4 0.000155 0.42 AML other m 2021-09-28T20:17:19.73
IV.CESX.HHE. ML:1.7 0.00034550000000000005 1.48 AML other m 2021-09-28T20:17:19.90
IV.ARRO.EHE. ML:1.4 0.0001565 0.24 AML other m 2021-09-28T20:17:20.23
IV.CESI.HHE. ML:1.3 0.00009039999999999999 1.36 AML other m 2021-09-28T20:17:20.91
IV.ARRO.EHN. ML:1.4 0.0001385 0.5 AML other m 2021-09-28T20:17:22.38
IV.CESI.HHN. ML:1.4 0.00013450000000000002 0.46 AML other m 2021-09-28T20:17:22.50
IV.NRCA.HHE. ML:1.6 0.0001375 1.02 AML other m 2021-09-28T20:17:24.02
IV.MML1.EHE. ML:1.3 0.00006105 0.2 AML other m 2021-09-28T20:17:24.65
IV.FDMO.HHN. ML:1.3 0.0000553 0.36 AML other m 2021-09-28T20:17:25.04
IV.NRCA.HHN. ML:1.4 0.0000854 0.12 AML other m 2021-09-28T20:17:25.45
IV.MML1.EHN. ML:1.3 0.00006705 0.5 AML other m 2021-09-28T20:17:25.66
IV.FDMO.HHE. ML:1.2 0.00004815 0.96 AML other m 2021-09-28T20:17:26.51
IV.RM33.EHN. ML:1.3 0.000042499999999999996 0.74 AML other m 2021-09-28T20:17:28.39
IV.RM33.EHE. ML:1.2 0.0000347 0.54 AML other m 2021-09-28T20:17:30.74
IV.SMA1.EHE. ML:1.4 0.0000547 0.42 AML other m 2021-09-28T20:17:30.89
IV.EL6.EHE. ML:2.0 0.000152 0.18 AML other m 2021-09-28T20:17:31.98
IV.EL6.EHN. ML:1.6 0.0000701 0.38 AML other m 2021-09-28T20:17:32.34
IV.SMA1.EHN. ML:1.5 0.00005785 1.42 AML other m 2021-09-28T20:17:35.04
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