Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 21-09-2021 and time 17:14:38 (Italy) in region 4 km N Spoleto (PG)

A magnitude ML 1.7 earthquake occured in region: 4 km N Spoleto (PG), on

  • 21-09-2021 15:14:38 (UTC)
  • 21-09-2021 17:14:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7720, 12.7540 at 10 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Spoleto PG 4 38218 38218
Campello sul Clitunno PG 6 2442 40660
Sant'Anatolia di Narco PG 8 564 41224
Castel Ritaldi PG 9 3278 44502
Vallo di Nera PG 9 364 44866
Scheggino PG 9 461 45327
Trevi PG 12 8469 53796
Cerreto di Spoleto PG 14 1075 54871
Giano dell'Umbria PG 16 3846 58717
Montefalco PG 16 5679 64396
Poggiodomo PG 16 117 64513
Ferentillo TR 17 1913 66426
Massa Martana PG 19 3770 70196
Acquasparta TR 19 4778 74974
Sellano PG 19 1079 76053
Montefranco TR 19 1276 77329

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km S of Foligno (57155 inhabitants)
25 Km NE of Terni (111501 inhabitants)
48 Km SE of Perugia (166134 inhabitants)
66 Km NE of Viterbo (67173 inhabitants)
71 Km NW of L'Aquila (69753 inhabitants)
79 Km W of Teramo (54892 inhabitants)
86 Km N of Guidonia Montecelio (88673 inhabitants)
90 Km N of Tivoli (56533 inhabitants)
100 Km N of Roma (2864731 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 1.7 2021-09-21
15:14:38		 42.7722 12.7537 10 2022-03-30
13:04:25		 Bollettino Sismico Italiano INGV 99283001
Reviewed
Rev100 		ML 1.6 2021-09-21
15:14:38		 42.778 12.7652 8 2021-09-21
16:20:11		 Sala Sismica INGV-Roma 95707681
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-21 15:14:38 ± 0.07
Latitude 42.7722 ± 0.0045
Longitude 12.7537 ± 0.0061
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99283001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 614
Semi-minor axis of confidence ellipse (meter) 349
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 229
Circular confidence region, given by single value of horizontal uncertainty (meter) 610.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 66
Number of associated phases, regardless of their use for origin computation 45
Number of defining phases 45
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.13040
Epicentral distance of station farthest from the epicenter (degree) 0.61244
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 23
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 38
Type of magnitude ML
Reference to an origin 95707681
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-21 16:20:11

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 38
Type of magnitude ML
Reference to an origin 99283001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-03 13:08:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHE. 2021-09-21T15:15:00.36 1.0 undecidable manual S 24 67.9764 50 0.67 20
IV.MF5.EHZ. 2021-09-21T15:14:59.11 0.1 undecidable manual S 67 62.1933 50 0.96 72
IV.MURB.HHZ. 2021-09-21T15:14:58.19 0.6 undecidable manual S 341 57.498 50 1.28 31
IV.MDAR.HNZ. 2021-09-21T15:14:56.83 0.3 undecidable manual S 34 56.2992 50 0.24 70
IV.CSP1.EHZ. 2021-09-21T15:14:55.25 0.1 undecidable manual S 46 51.0156 50 0.09 97
IV.MTRA.EHN. 2021-09-21T15:14:55.58 0.3 undecidable manual S 92 52.4031 50 0.05 73
IV.SMA1.EHZ. 2021-09-21T15:14:55.39 0.3 undecidable manual S 108 49.9167 50 0.51 66
IV.T1299.EHZ. 2021-09-21T15:14:54.08 0.1 undecidable manual S 109 45.7209 50 0.32 93
IV.MMO1.EHZ. 2021-09-21T15:14:54.45 0.3 undecidable manual S 73 48.7179 50 -0.1 72
IV.MML1.EHZ. 2021-09-21T15:14:52.65 0.3 undecidable manual S 25 41.8248 50 -0.06 74
IV.MC2.EHZ. 2021-09-21T15:14:52.17 0.6 undecidable manual S 66 38.628 50 0.31 71
IV.EL6.EHE. 2021-09-21T15:14:51.16 0.6 undecidable manual P 24 67.9764 50 0.33 45
IV.FDMO.HHZ. 2021-09-21T15:14:51.91 0.3 undecidable manual S 43 39.9267 50 -0.3 71
IT.MTCL.HGZ. 2021-09-21T15:14:49.56 0.3 undecidable manual S 39 31.6461 50 -0.45 69
IV.NRCA.HHZ. 2021-09-21T15:14:49.29 0.3 undecidable manual S 77 30.1476 50 -0.3 72
IV.FEMA.HNZ. 2021-09-21T15:14:49.99 0.3 undecidable manual S 49 32.0457 50 -0.1 75
IV.LNSS.HHZ. 2021-09-21T15:14:49.19 0.3 undecidable manual S 129 29.9478 50 -0.36 71
IV.MF5.EHZ. 2021-09-21T15:14:49.81 0.6 undecidable manual P 67 62.1933 50 -0.14 47
IV.MDAR.HNZ. 2021-09-21T15:14:49.25 0.6 undecidable manual P 34 56.2992 50 0.21 47
IV.ASSB.HHZ. 2021-09-21T15:14:49.85 0.3 undecidable manual S 346 30.9468 50 0.03 76
IV.MURB.HHZ. 2021-09-21T15:14:49.33 0.3 undecidable manual P 341 57.498 50 0.1 71
IV.CESI.HHZ. 2021-09-21T15:14:48.88 0.3 undecidable manual S 25 28.5492 50 -0.3 72
IV.CSP1.EHZ. 2021-09-21T15:14:48.14 0.1 undecidable manual P 46 51.0156 50 -0.08 97
IV.MTRA.EHN. 2021-09-21T15:14:48.30 0.1 undecidable manual P 92 52.4031 50 -0.13 95
IV.SNTG.HHZ. 2021-09-21T15:14:48.87 0.1 undecidable manual P 16 55.6998 50 -0.07 96
IV.SMA1.EHZ. 2021-09-21T15:14:47.98 0.6 undecidable manual P 108 49.9167 50 -0.08 48
IV.ARRO.EHZ. 2021-09-21T15:14:47.10 0.6 undecidable manual S 177 21.4674 114 0.23 49
IV.T1299.EHZ. 2021-09-21T15:14:47.38 0.1 undecidable manual P 109 45.7209 50 -0.03 99
IV.CESX.HHZ. 2021-09-21T15:14:47.04 0.3 undecidable manual S 217 22.6551 113 -0.23 74
IV.MMO1.EHZ. 2021-09-21T15:14:47.73 0.1 undecidable manual P 73 48.7179 50 -0.14 96
IV.FDMO.HHZ. 2021-09-21T15:14:46.36 0.3 undecidable manual P 43 39.9267 50 -0.16 73
IV.MML1.EHZ. 2021-09-21T15:14:46.64 0.3 undecidable manual P 25 41.8248 50 -0.17 72
IV.MC2.EHZ. 2021-09-21T15:14:46.31 0.3 undecidable manual P 66 38.628 50 -0.01 75
IV.MOMA.HHZ. 2021-09-21T15:14:45.06 0.3 undecidable manual S 283 15.3735 122 0.06 78
IV.FEMA.HNZ. 2021-09-21T15:14:45.27 0.3 undecidable manual P 49 32.0457 50 -0.02 76
IV.ASSB.HHZ. 2021-09-21T15:14:44.86 0.3 undecidable manual P 346 30.9468 50 -0.28 72
IV.CESI.HHZ. 2021-09-21T15:14:44.66 0.1 undecidable manual P 25 28.5492 50 -0.11 75
IT.MTCL.HGZ. 2021-09-21T15:14:44.72 0.6 undecidable manual P 39 31.6461 50 -0.53 45
IV.NRCA.HHZ. 2021-09-21T15:14:44.69 0.3 undecidable manual P 77 30.1476 50 -0.31 72
IV.GAVE.EHZ. 2021-09-21T15:14:44.81 0.3 undecidable manual S 128 14.4744 123 0.06 78
IV.LNSS.HHZ. 2021-09-21T15:14:44.82 0.3 undecidable manual P 129 29.9478 50 -0.16 74
IV.CESX.HHZ. 2021-09-21T15:14:43.91 0.6 undecidable manual P 217 22.6551 113 0.25 49
IV.ARRO.EHZ. 2021-09-21T15:14:43.12 0.6 undecidable manual P 177 21.4674 114 -0.31 49
IV.GAVE.EHZ. 2021-09-21T15:14:42.36 0.3 undecidable manual P 128 14.4744 123 0.15 76
IV.MOMA.HHZ. 2021-09-21T15:14:42.58 0.1 undecidable manual P 283 15.3735 122 0.22 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.HNE. ML:2.1 0.0011750324999999999 0.1792 AML other m 2021-09-21T15:14:45.24
IV.GAVE.EHE. ML:2.0 0.001145 0.18 AML other m 2021-09-21T15:14:45.24
IV.GAVE.HNN. ML:1.4 0.00025352615 0.1024 AML other m 2021-09-21T15:14:45.43
IV.MOMA.HHN. ML:1.8 0.000666 0.24 AML other m 2021-09-21T15:14:45.60
IV.MOMA.HNN. ML:1.8 0.0006734999999999999 0.24 AML other m 2021-09-21T15:14:45.61
IV.MOMA.HHE. ML:2.1 0.001222515 0.192 AML other m 2021-09-21T15:14:45.82
IV.MOMA.HNE. ML:2.1 0.001127 0.2 AML other m 2021-09-21T15:14:45.83
IV.GAVE.EHN. ML:1.9 0.00081073295 0.128 AML other m 2021-09-21T15:14:46.23
IV.ARRO.EHE. ML:1.4 0.00017749999999999998 0.26 AML other m 2021-09-21T15:14:47.78
IV.ARRO.EHN. ML:1.2 0.00010541508 0.2304 AML other m 2021-09-21T15:14:48.22
IV.CESX.HHN. ML:1.4 0.0001645 0.22 AML other m 2021-09-21T15:14:48.63
IV.CESX.HHE. ML:1.3 0.000125 1.62 AML other m 2021-09-21T15:14:48.99
IV.CESI.HHE. ML:1.5 0.0001585782 0.128 AML other m 2021-09-21T15:14:49.07
IV.CESI.HNE. ML:1.4 0.00012700218999999997 0.064 AML other m 2021-09-21T15:14:49.16
IV.CESI.HHN. ML:1.9 0.00041700000000000005 0.24 AML other m 2021-09-21T15:14:49.22
IV.CESI.HNN. ML:1.9 0.00038413294999999997 0.1664 AML other m 2021-09-21T15:14:49.23
IV.LNSS.HHE. ML:1.8 0.000305 0.12 AML other m 2021-09-21T15:14:49.40
IV.LNSS.HNE. ML:1.8 0.00026907254999999995 0.1792 AML other m 2021-09-21T15:14:49.47
IV.NRCA.HNE. ML:1.6 0.00018910355 0.1408 AML other m 2021-09-21T15:14:49.65
IV.NRCA.HHN. ML:1.6 0.00018187205 0.0512 AML other m 2021-09-21T15:14:49.95
IV.LNSS.HNN. ML:1.8 0.00027826260000000003 1.7568 AML other m 2021-09-21T15:14:50.96
IV.LNSS.HHN. ML:1.8 0.0003465 1.76 AML other m 2021-09-21T15:14:50.09
IV.ASSB.HHN. ML:1.4 0.0001131278 0.1792 AML other m 2021-09-21T15:14:50.25
IV.NRCA.HHE. ML:1.6 0.00020808415 0.1408 AML other m 2021-09-21T15:14:50.68
IV.ASSB.HHE. ML:1.5 0.00014050000000000003 0.22 AML other m 2021-09-21T15:14:50.74
IV.NRCA.HNN. ML:1.5 0.0001656115 0.128 AML other m 2021-09-21T15:14:50.77
IV.FDMO.HHE. ML:1.5 0.00011313324999999999 0.128 AML other m 2021-09-21T15:14:52.94
IV.MML1.EHE. ML:1.4 0.00008017531 1.7824 AML other m 2021-09-21T15:14:52.11
IV.FDMO.HHN. ML:1.5 0.00010315 1.88 AML other m 2021-09-21T15:14:53.05
IV.MML1.EHN. ML:1.4 0.00008612217 0.1408 AML other m 2021-09-21T15:14:53.15
IV.CSP1.EHN. ML:1.9 0.0002 1.52 AML other m 2021-09-21T15:14:55.08
IV.CSP1.EHE. ML:2.1 0.0003395 1.76 AML other m 2021-09-21T15:14:56.09
IV.SMA1.EHN. ML:1.5 0.0000835 0.4 AML other m 2021-09-21T15:14:57.29
IV.SMA1.EHE. ML:1.6 0.00010339999999999999 0.26 AML other m 2021-09-21T15:14:58.18
IV.MURB.HHE. ML:1.7 0.00011035 0.18 AML other m 2021-09-21T15:14:59.42
IV.MURB.HNE. ML:1.7 0.00010112487000000001 0.2048 AML other m 2021-09-21T15:14:59.35
IV.MURB.HHN. ML:1.8 0.000127785 0.3456 AML other m 2021-09-21T15:14:59.75
IV.MURB.HNN. ML:1.7 0.00011962453 0.2176 AML other m 2021-09-21T15:15:00.10
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