Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 19-09-2021 and time 09:28:35 (Italy) in region 4 km N Acquasparta (TR)

A magnitude ML 1.4 earthquake occured in region: 4 km N Acquasparta (TR), on

  • 19-09-2021 07:28:35 (UTC)
  • 19-09-2021 09:28:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7300, 12.5610 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.

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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
Acquasparta TR 4 4778 4778
Massa Martana PG 6 3770 8548
Montecastrilli TR 11 5022 13570
Giano dell'Umbria PG 12 3846 17416
San Gemini TR 13 5018 22434
Avigliano Umbro TR 14 2558 24992
Todi PG 14 16851 41843
Castel Ritaldi PG 14 3278 45121
Spoleto PG 15 38218 83339
Montefalco PG 20 5679 89018
Gualdo Cattaneo PG 20 6155 95173
Terni TR 20 111501 206674

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km NW of Terni (111501 inhabitants)
28 Km SW of Foligno (57155 inhabitants)
44 Km SE of Perugia (166134 inhabitants)
51 Km NE of Viterbo (67173 inhabitants)
81 Km NW of L'Aquila (69753 inhabitants)
82 Km N of Guidonia Montecelio (88673 inhabitants)
87 Km N of Tivoli (56533 inhabitants)
93 Km N of Roma (2864731 inhabitants)
94 Km W of Teramo (54892 inhabitants)
95 Km NE of Civitavecchia (52991 inhabitants)
99 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
Reviewed
Rev100 		ML 1.4 2021-09-19
07:28:35		 42.7303 12.5607 9 2021-09-19
07:40:52		 Sala Sismica INGV-Roma 95624361
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-19 07:28:35 ± 0.06
Latitude 42.7303 ± 0.0036
Longitude 12.5607 ± 0.0049
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 95624361

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 435
Semi-minor axis of confidence ellipse (meter) 241
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 225
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 113
Number of associated phases, regardless of their use for origin computation 43
Number of defining phases 41
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.73924
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 21
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 34
Type of magnitude ML
Reference to an origin 95624361
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-19 07:40:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SACR.HHZ. 2021-09-19T07:29:36.57 3.0 undecidable manual Sn 0.01 0
IV.PE3.EHZ. 2021-09-19T07:29:09.26 3.0 undecidable manual Sg 0.27 0
IV.CAFI.HHZ. 2021-09-19T07:29:01.39 1.0 undecidable manual S 324 82.0512 50 1.03 16
IV.EL6.EHZ. 2021-09-19T07:29:00.59 0.6 undecidable manual S 33 79.6647 50 0.89 34
IV.ATMI.HHZ. 2021-09-19T07:28:57.55 1.0 undecidable manual S 341 71.0733 50 0.13 22
IV.ATVA.EHZ. 2021-09-19T07:28:56.63 0.6 undecidable manual S 340 64.7907 50 0.89 35
IV.CSP1.EHZ. 2021-09-19T07:28:56.40 0.1 undecidable manual S 52 65.8896 50 0.35 84
IV.RM33.EHZ. 2021-09-19T07:28:54.47 0.3 undecidable manual S 114 58.7967 50 0.34 64
IV.MURB.HHZ. 2021-09-19T07:28:53.95 1.0 undecidable manual S 357 59.1963 50 -0.29 22
IV.SACS.HNE. 2021-09-19T07:28:53.87 1.0 undecidable manual S 284 54.6009 50 0.84 18
IV.MML1.EHZ. 2021-09-19T07:28:53.06 1.0 undecidable manual S 38 54.0015 50 0.18 22
IV.FDMO.HHZ. 2021-09-19T07:28:53.09 0.6 undecidable manual S 51 54.6009 50 0.05 46
IV.NRCA.HHZ. 2021-09-19T07:28:50.98 0.1 undecidable manual S 76 46.5201 50 0.12 92
IV.LNSS.HHZ. 2021-09-19T07:28:49.68 0.3 undecidable manual S 110 41.625 50 0.12 69
IV.MGAB.HNE. 2021-09-19T07:28:49.47 0.3 undecidable manual S 299 41.7249 50 -0.12 69
IV.EL6.EHZ. 2021-09-19T07:28:49.45 0.6 negative manual P 33 79.6647 50 -0.02 44
IV.CESI.HHZ. 2021-09-19T07:28:49.23 0.3 undecidable manual S 42 41.3253 50 -0.25 67
IV.CAFI.HHZ. 2021-09-19T07:28:49.69 0.6 positive manual P 324 82.0512 50 -0.16 42
IV.ATMI.HHZ. 2021-09-19T07:28:48.26 0.6 undecidable manual P 341 71.0733 50 0.1 44
IV.ATVA.EHZ. 2021-09-19T07:28:47.03 0.1 undecidable manual P 340 64.7907 50 -0.16 88
IV.ASSB.HHZ. 2021-09-19T07:28:47.90 1.0 undecidable manual S 13 35.5422 50 -0.04 24
IV.CSP1.EHZ. 2021-09-19T07:28:47.46 0.6 undecidable manual P 52 65.8896 50 0.1 44
IV.ATLO.HNZ. 2021-09-19T07:28:47.28 0.1 undecidable manual P 349 66.0894 50 -0.1 89
IV.RM33.EHZ. 2021-09-19T07:28:46.01 0.1 undecidable manual P 114 58.7967 50 -0.25 87
IV.MURB.HHZ. 2021-09-19T07:28:46.25 0.6 undecidable manual P 357 59.1963 50 -0.07 45
IV.FDMO.HHZ. 2021-09-19T07:28:45.29 0.1 undecidable manual P 51 54.6009 50 -0.34 86
IV.GAVE.EHZ. 2021-09-19T07:28:45.40 0.3 undecidable manual S 99 27.5502 108 -0.13 71
IV.SACS.HNE. 2021-09-19T07:28:45.98 0.3 undecidable manual P 284 54.6009 50 0.36 64
IV.MML1.EHZ. 2021-09-19T07:28:45.24 0.1 undecidable manual P 38 54.0015 50 -0.29 87
IV.ARRO.EHZ. 2021-09-19T07:28:44.62 0.3 undecidable manual S 135 23.6541 110 0.34 68
IV.NRCA.HHZ. 2021-09-19T07:28:44.27 0.1 positive manual P 76 46.5201 50 -0.1 92
IV.LNSS.HHZ. 2021-09-19T07:28:43.35 0.3 positive manual P 110 41.625 50 -0.26 67
IV.MGAB.HNE. 2021-09-19T07:28:43.28 0.1 undecidable manual P 299 41.7249 50 -0.35 88
IV.CESI.HHZ. 2021-09-19T07:28:43.41 0.1 undecidable manual P 42 41.3253 50 -0.17 92
IV.ASSB.HHZ. 2021-09-19T07:28:42.31 0.1 positive manual P 13 35.5422 50 -0.37 89
IV.CESX.HHZ. 2021-09-19T07:28:41.16 0.3 undecidable manual S 171 13.6752 123 0 74
IV.GAVE.EHZ. 2021-09-19T07:28:41.05 0.6 undecidable manual P 99 27.5502 108 -0.24 46
IV.ARRO.EHZ. 2021-09-19T07:28:40.68 0.6 undecidable manual P 135 23.6541 110 0.11 48
IV.MOMA.HHZ. 2021-09-19T07:28:39.78 0.1 undecidable manual S 5 8.1807 137 0.09 98
IT.GNU.HGZ. 2021-09-19T07:28:39.67 0.1 undecidable manual S 5 8.1807 137 -0.01 100
IV.MOMA.HHZ. 2021-09-19T07:28:38.06 1.0 undecidable manual P 5 8.1807 137 0.14 24
IT.GNU.HGZ. 2021-09-19T07:28:38.11 0.1 undecidable manual P 5 8.1807 137 0.19 96
IV.CESX.HHZ. 2021-09-19T07:28:38.83 0.3 positive manual P 171 13.6752 123 0.06 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHN. ML:1.9 0.001153606 0.0832 AML other m 2021-09-19T07:28:40.43
IV.MOMA.HNN. ML:1.8 0.0010022029 0.16 AML other m 2021-09-19T07:28:39.88
IV.MOMA.HNE. ML:1.9 0.0012194704999999998 0.1344 AML other m 2021-09-19T07:28:40.53
IV.MOMA.HHE. ML:2.0 0.001363798 0.1216 AML other m 2021-09-19T07:28:40.53
IV.CESX.HHN. ML:1.5 0.00032140019999999997 0.2816 AML other m 2021-09-19T07:28:42.28
IV.CESX.HHE. ML:1.3 0.00022542375 0.3008 AML other m 2021-09-19T07:28:43.06
IV.ARRO.EHN. ML:1.2 0.000112 0.2 AML other m 2021-09-19T07:28:44.66
IV.ARRO.EHE. ML:1.4 0.0001585 0.18 AML other m 2021-09-19T07:28:46.13
IV.GAVE.EHE. ML:1.6 0.0001949805 0.2432 AML other m 2021-09-19T07:28:46.38
IV.GAVE.EHN. ML:1.4 0.00012522195 0.1408 AML other m 2021-09-19T07:28:46.49
IV.ASSB.HHN. ML:1.0 0.000044396195 0.1856 AML other m 2021-09-19T07:28:49.09
IV.ASSB.HHE. ML:1.0 0.000041620644999999996 0.0768 AML other m 2021-09-19T07:28:49.42
IV.LNSS.HHE. ML:1.3 0.000070553235 0.1216 AML other m 2021-09-19T07:28:50.80
IV.LNSS.HHN. ML:1.5 0.00009674640499999999 0.1408 AML other m 2021-09-19T07:28:50.95
IV.NRCA.HHN. ML:1.3 0.000056999999999999996 0.14 AML other m 2021-09-19T07:28:51.69
IV.NRCA.HHE. ML:1.3 0.00005535 0.12 AML other m 2021-09-19T07:28:53.85
IV.FDMO.HHN. ML:0.8 0.0000166040675 0.1152 AML other m 2021-09-19T07:28:54.94
IV.MML1.EHN. ML:0.9 0.000019900000000000003 0.8 AML other m 2021-09-19T07:28:54.43
IV.MML1.EHE. ML:0.9 0.000022100000000000002 0.68 AML other m 2021-09-19T07:28:55.54
IV.RM33.EHN. ML:1.1 0.00002459099 0.1792 AML other m 2021-09-19T07:28:55.84
IV.RM33.EHE. ML:1.3 0.00004743989499999999 0.1792 AML other m 2021-09-19T07:28:55.72
IV.MURB.HHE. ML:1.7 0.00011235000000000001 0.3 AML other m 2021-09-19T07:28:56.77
IV.FDMO.HHE. ML:0.9 0.0000201 1.22 AML other m 2021-09-19T07:28:57.30
IV.MURB.HHN. ML:1.6 0.00009115 0.5 AML other m 2021-09-19T07:29:00.08
IV.ATMI.HHN. ML:1.7 0.00007277212499999999 0.2368 AML other m 2021-09-19T07:29:02.39
IV.ATMI.HHE. ML:1.7 0.00007535 0.26 AML other m 2021-09-19T07:29:02.62
IV.CAFI.HHE. ML:0.9 0.0000124 1.22 AML other m 2021-09-19T07:29:04.94
IV.GAVE.HNE. ML:1.6 0.0001969167 0.2688 AML other m 2021-09-19T07:28:46.37
IV.MURB.HNE. ML:1.8 0.00013864069499999997 0.2752 AML other m 2021-09-19T07:28:58.64
IV.MURB.HNN. ML:1.8 0.000129764307 0.32 AML other m 2021-09-19T07:28:57.85
IV.CSP1.EHE. ML:1.3 0.00003331806 0.4224 AML other m 2021-09-19T07:29:00.82
IV.CSP1.EHN. ML:1.4 0.000043365615000000005 0.1408 AML other m 2021-09-19T07:28:57.47
IV.EL6.EHE. ML:1.2 0.000023738885 0.32 AML other m 2021-09-19T07:29:08.26
IV.EL6.EHN. ML:1.2 0.000025279030000000002 0.416 AML other m 2021-09-19T07:29:06.04
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