Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.2 on date 01-09-2021 and time 01:37:58 (Italy) in region Acquasparta (TR)

A magnitude ML 2.2 earthquake occured in region: Acquasparta (TR), on

  • 31-08-2021 23:37:58 (UTC)
  • 01-09-2021 01:37:58 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6900, 12.5430 at 9 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
Acquasparta TR 0 4778 4778
Montecastrilli TR 6 5022 9800
San Gemini TR 8 5018 14818
Massa Martana PG 10 3770 18588
Avigliano Umbro TR 10 2558 21146
Todi PG 15 16851 37997
Giano dell'Umbria PG 16 3846 41843
Terni TR 17 111501 153344
Spoleto PG 17 38218 191562
Amelia TR 18 11897 203459
Castel Ritaldi PG 18 3278 206737
Narni TR 19 19785 226522

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km NW of Terni (111501 inhabitants)
33 Km SW of Foligno (57155 inhabitants)
47 Km NE of Viterbo (67173 inhabitants)
48 Km S of Perugia (166134 inhabitants)
78 Km N of Guidonia Montecelio (88673 inhabitants)
80 Km W of L'Aquila (69753 inhabitants)
83 Km N of Tivoli (56533 inhabitants)
89 Km N of Roma (2864731 inhabitants)
91 Km NE of Civitavecchia (52991 inhabitants)
95 Km W of Teramo (54892 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 2.2 2021-08-31
23:37:58		 42.6897 12.5432 9 2021-12-29
11:12:52		 Bollettino Sismico Italiano INGV 97587721
Reviewed
Rev100 		ML 2.2 2021-08-31
23:37:58		 42.6873 12.5463 9 2021-08-31
23:46:20		 Sala Sismica INGV-Roma 94891001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-31 23:37:58 ± 0.04
Latitude 42.6897 ± 0.0018
Longitude 12.5432 ± 0.0024
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97587721

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 239
Semi-minor axis of confidence ellipse (meter) 83
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 77
Circular confidence region, given by single value of horizontal uncertainty (meter) 240.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 58
Number of associated phases, regardless of their use for origin computation 74
Number of defining phases 59
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.02433
Number of stations at which the event was observed 53
Number of stations from which data was used for origin computation 39
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.2
Num. used stations 76
Type of magnitude ML
Reference to an origin 94891001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-31 23:46:20

ML:2.2

Field Value
Value 2.2
Uncertainty 0.1
Num. used stations 20
Type of magnitude ML
Reference to an origin 97587721
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-19 10:56:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CDRU.HHZ. 2021-08-31T23:39:29.67 3.0 undecidable manual Sg 7.04 0
OT.OT14.EHZ. 2021-08-31T23:38:43.61 3.0 negative manual Pn 3.39 0
IV.RCAV.EHZ. 2021-08-31T23:38:29.42 3.0 undecidable manual S -0.09 0
IV.RNI2.HHZ. 2021-08-31T23:38:24.34 3.0 undecidable manual P -1.19 0
IV.MMO1.EHZ. 2021-08-31T23:38:20.08 1.0 undecidable manual S 70 67.8765 50 0.39 21
IV.GIUL.HHZ. 2021-08-31T23:38:20.73 3.0 undecidable manual P 0
IV.CSP1.EHZ. 2021-08-31T23:38:20.46 1.0 undecidable manual S 50 69.8745 50 0.24 22
IV.FIAM.HHZ. 2021-08-31T23:38:19.51 1.0 undecidable manual S 135 66.2781 50 0.25 22
IV.CRE.HHZ. 2021-08-31T23:38:18.32 3.0 undecidable manual P 113.6973 0.49 0
IV.BARO.EHZ. 2021-08-31T23:38:18.86 1.0 undecidable manual S 220 63.3921 50 0.37 21
IV.COR1.EHZ. 2021-08-31T23:38:18.27 3.0 undecidable manual P 110.9001 0.88 0
IV.PARC.HHZ. 2021-08-31T23:38:17.70 3.0 undecidable manual P 109.2129 0.56 0
IV.MML1.EHZ. 2021-08-31T23:38:17.45 0.6 undecidable manual S 36 58.497 50 0.27 44
IV.RM33.EHZ. 2021-08-31T23:38:17.22 0.6 undecidable manual S 110 58.3971 50 0.07 46
IV.FDMO.HHZ. 2021-08-31T23:38:17.36 0.6 undecidable manual S 49 58.5969 50 0.14 45
IV.MNTT.EHZ. 2021-08-31T23:38:16.06 3.0 undecidable manual P 95.0382 1.11 0
IV.NARO.HHZ. 2021-08-31T23:38:16.46 0.6 undecidable manual P 2 102.2199 50 0.39 39
IV.SSP9.EHZ. 2021-08-31T23:38:16.74 3.0 undecidable manual P 103.6185 0.46 0
IV.RCAV.EHZ. 2021-08-31T23:38:15.19 3.0 undecidable manual Pg 0
IV.APEC.HHZ. 2021-08-31T23:38:15.74 3.0 undecidable manual P 96.9252 0.5 0
IT.MMP1.HGN. 2021-08-31T23:38:15.55 1.0 undecidable manual S 161 51.6039 50 0.19 23
IV.ARCI.HHZ. 2021-08-31T23:38:15.02 3.0 undecidable manual P 88.7445 1.03 0
IV.SRES.HHZ. 2021-08-31T23:38:14.90 0.6 undecidable manual S 183 50.3163 50 -0.09 46
IV.ARVD.HHZ. 2021-08-31T23:38:14.95 0.6 undecidable manual P 20 95.3379 50 -0.05 43
IV.NRCA.HHZ. 2021-08-31T23:38:14.93 0.6 undecidable manual S 71 49.2174 50 0.23 45
IV.CING.HHZ. 2021-08-31T23:38:14.63 0.3 undecidable manual P 35 92.6406 50 0.04 65
IV.MF5.EHZ. 2021-08-31T23:38:13.54 3.0 undecidable manual P 81.5517 0.66 0
IV.SSFR.HHZ. 2021-08-31T23:38:13.40 0.6 undecidable manual P 13 85.0482 50 -0.02 44
IV.ATPI.EHZ. 2021-08-31T23:38:13.61 0.6 undecidable manual P 352 85.1481 50 0.17 43
IV.LNSS.HHZ. 2021-08-31T23:38:13.00 0.6 undecidable manual S 103 41.7249 50 0.3 45
IV.CAFI.HHZ. 2021-08-31T23:38:13.38 0.3 undecidable manual P 327 84.9483 50 -0.03 66
IV.MGAB.HHZ. 2021-08-31T23:38:13.12 0.6 undecidable manual S 305 42.9237 50 0.09 47
IV.CERT.HHZ. 2021-08-31T23:38:13.64 3.0 undecidable manual P 89.6436 -0.49 0
IV.EL6.EHZ. 2021-08-31T23:38:13.28 0.6 undecidable manual P 32 84.1491 50 0 44
IV.CESI.HHZ. 2021-08-31T23:38:13.69 0.6 undecidable manual S 40 45.7209 50 -0.08 47
IV.ATFO.HHZ. 2021-08-31T23:38:12.07 0.6 undecidable manual P 2 75.1692 50 0.18 43
IV.ASSB.HHZ. 2021-08-31T23:38:12.03 0.6 undecidable manual S 13 40.2264 50 -0.28 45
IV.GUMA.HHZ. 2021-08-31T23:38:12.48 1.0 undecidable manual P 57 76.5678 50 0.37 21
IV.ATVO.HHZ. 2021-08-31T23:38:12.11 0.6 undecidable manual P 352 77.6667 50 -0.16 43
TV.SF04.EHZ. 2021-08-31T23:38:12.07 1.0 undecidable manual P 283 73.6707 50 0.4 21
IV.MCIV.CHE. 2021-08-31T23:38:11.69 1.0 undecidable manual P 278 71.2731 50 0.39 21
IV.ATMI.HHZ. 2021-08-31T23:38:11.98 0.6 undecidable manual P 343 74.8695 50 0.12 44
IV.MTCE.HHZ. 2021-08-31T23:38:11.74 0.6 undecidable manual P 167 75.7686 50 -0.24 43
IV.CSP1.EHZ. 2021-08-31T23:38:11.03 0.6 undecidable manual P 50 69.8745 50 -0.05 45
IV.SMA1.EHZ. 2021-08-31T23:38:10.36 0.6 undecidable manual P 96 64.9905 50 0.04 45
IV.FIAM.HHZ. 2021-08-31T23:38:10.37 0.6 undecidable manual P 135 66.2781 50 -0.16 44
IV.MMO1.EHZ. 2021-08-31T23:38:10.67 0.3 undecidable manual P 70 67.8765 50 -0.1 67
IV.BARO.EHZ. 2021-08-31T23:38:10.41 0.6 undecidable manual P 220 63.3921 50 0.32 43
IT.FOPC.HGE. 2021-08-31T23:38:10.55 0.6 undecidable manual S 23 33.6441 50 -0.01 48
IV.MURB.HHZ. 2021-08-31T23:38:10.13 0.6 undecidable manual P 359 63.5919 50 0.02 46
IV.FDMO.HHZ. 2021-08-31T23:38:09.19 0.6 undecidable manual P 49 58.5969 50 -0.16 45
IV.MC2.EHZ. 2021-08-31T23:38:09.41 0.6 undecidable manual P 65 57.9975 50 0.15 45
IV.MML1.EHZ. 2021-08-31T23:38:09.16 0.6 undecidable manual P 36 58.497 50 -0.17 45
IV.GAVE.EHZ. 2021-08-31T23:38:09.15 0.6 undecidable manual S 89 28.6491 107 0.17 47
IT.MMP1.HGN. 2021-08-31T23:38:08.07 0.6 undecidable manual P 161 51.6039 50 -0.2 45
IV.ATCC.EHZ. 2021-08-31T23:38:08.71 0.3 undecidable manual P 8 55.5 50 -0.16 68
IV.SACS.HHZ. 2021-08-31T23:38:08.76 1.0 undecidable manual P 289 54.501 50 0.04 23
IV.RM33.EHZ. 2021-08-31T23:38:08.96 0.6 undecidable manual P 110 58.3971 50 -0.34 43
IV.CESI.HHZ. 2021-08-31T23:38:07.21 0.3 undecidable manual P 40 45.7209 50 -0.14 69
IV.SRES.HHZ. 2021-08-31T23:38:07.69 0.6 undecidable manual P 183 50.3163 50 -0.37 44
IV.NRCA.HHZ. 2021-08-31T23:38:07.68 0.6 undecidable manual P 71 49.2174 50 -0.21 45
IV.MGAB.HHZ. 2021-08-31T23:38:06.80 0.3 undecidable manual P 305 42.9237 50 -0.13 70
IV.ARRO.EHZ. 2021-08-31T23:38:06.89 0.6 undecidable manual S 124 21.867 112 0.11 48
IV.ASSB.HHZ. 2021-08-31T23:38:06.29 0.3 undecidable manual P 13 40.2264 50 -0.23 69
IV.LNSS.HHZ. 2021-08-31T23:38:06.54 0.3 undecidable manual P 103 41.7249 50 -0.2 69
IT.FOPC.HGE. 2021-08-31T23:38:05.36 0.6 undecidable manual P 23 33.6441 50 -0.14 47
IV.GAVE.EHZ. 2021-08-31T23:38:04.30 0.3 undecidable manual P 89 28.6491 107 -0.29 69
IT.GNU.HGZ. 2021-08-31T23:38:03.96 0.3 undecidable manual S 10 12.876 124 -0.03 75
IV.CESX.HHN. 2021-08-31T23:38:03.17 0.3 undecidable manual S 158 9.6792 132 0.05 75
IV.ARRO.EHZ. 2021-08-31T23:38:03.32 0.1 undecidable manual P 124 21.867 112 0 99
IV.MOMA.HNZ. 2021-08-31T23:38:03.92 0.3 undecidable manual S 10 12.876 124 -0.07 74
IV.CESX.HHN. 2021-08-31T23:38:01.26 0.1 undecidable manual P 158 9.6792 132 0.05 100
IV.MOMA.HNZ. 2021-08-31T23:38:01.87 0.3 undecidable manual P 10 12.876 124 0.16 73
IT.GNU.HGZ. 2021-08-31T23:38:01.87 0.3 undecidable manual P 10 12.876 124 0.16 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHE. ML:2.1 0.0007384999999999999 0.14 AML other m 2021-08-31T23:38:10.76
IV.GAVE.EHN. ML:2.2 0.0008015000000000001 0.2 AML other m 2021-08-31T23:38:10.94
IV.ASSB.HHN. ML:2.1 0.0004685 0.36 AML other m 2021-08-31T23:38:14.05
IV.LNSS.HHE. ML:2.3 0.000629 0.92 AML other m 2021-08-31T23:38:15.57
IV.NRCA.HHN. ML:2.2 0.00044 0.12 AML other m 2021-08-31T23:38:15.55
IV.ASSB.HHE. ML:2.1 0.000428 1.28 AML other m 2021-08-31T23:38:15.77
IV.LNSS.HHN. ML:2.3 0.0006140000000000001 1 AML other m 2021-08-31T23:38:16.79
IV.NRCA.HHE. ML:2.2 0.00047599999999999997 0.16 AML other m 2021-08-31T23:38:16.51
IV.RM33.EHE. ML:2.3 0.00039400000000000004 0.22 AML other m 2021-08-31T23:38:18.37
IV.RM33.EHN. ML:2.2 0.0003275 0.48 AML other m 2021-08-31T23:38:18.90
IV.MML1.EHE. ML:2.2 0.0003235 1.7 AML other m 2021-08-31T23:38:22.10
IV.MML1.HNE. ML:2.2 0.0003055 0.24 AML other m 2021-08-31T23:38:23.10
IV.MML1.EHN. ML:2.1 0.00028599999999999996 1.1 AML other m 2021-08-31T23:38:23.31
IV.MML1.HNN. ML:2.1 0.000277 0.52 AML other m 2021-08-31T23:38:23.05
IV.CING.HHN. ML:2.3 0.00022250000000000001 0.34 AML other m 2021-08-31T23:38:27.94
IV.MF5.EHE. ML:2.1 0.000168 0.68 AML other m 2021-08-31T23:38:31.51
IV.RCAV.EHN. ML:2.2 0.00017199999999999998 0.3 AML other m 2021-08-31T23:38:31.05
IV.CING.HHE. ML:2.0 0.0001275 0.52 AML other m 2021-08-31T23:38:32.27
IV.MF5.EHN. ML:2.1 0.000178 0.66 AML other m 2021-08-31T23:38:32.53
IV.RCAV.EHE. ML:2.2 0.0001705 1.48 AML other m 2021-08-31T23:38:33.83
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
Waveforms Seismic signals in miniseed + resp format Download