Earthquake with magnitude of ML 1.1 on date 13-09-2021 and time 06:47:57 (UTC) in region 1 km E Acquasparta (TR)

A magnitude ML 1.1 earthquake occured in region: 1 km E Acquasparta (TR), on

  • 13-09-2021 06:47:57 (UTC)
  • 13-09-2021 08:47:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.69, 12.56 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.

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 1 4778 4778
Montecastrilli TR 7 5022 9800
San Gemini TR 8 5018 14818
Massa Martana PG 10 3770 18588
Avigliano Umbro TR 11 2558 21146
Spoleto PG 16 38218 59364
Terni TR 16 111501 170865
Giano dell'Umbria PG 16 3846 174711
Todi PG 16 16851 191562
Castel Ritaldi PG 18 3278 194840
Amelia TR 19 11897 206737
Narni TR 19 19785 226522
Montefranco TR 20 1276 227798

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km NW of Terni (111501 inhabitants)
32 Km SW of Foligno (57155 inhabitants)
48 Km NE of Viterbo (67173 inhabitants)
49 Km S of Perugia (166134 inhabitants)
78 Km N of Guidonia Montecelio (88673 inhabitants)
78 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)
94 Km W of Teramo (54892 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.1 2021-09-13
06:47:57
42.6897 12.5603 9 2021-09-13
06:58:13
Sala Sismica INGV-Roma 95372691
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-13 06:47:57 ± 0.05
Latitude 42.6897 ± 0.0027
Longitude 12.5603 ± 0.0061
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 95372691

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 473
Semi-minor axis of confidence ellipse (meter) 227
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 68
Circular confidence region, given by single value of horizontal uncertainty (meter) 470
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 137
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.43078
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 95372691
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-13 06:58:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
NI.VINO.HHZ. 2021-09-13T06:49:44.27 3.0 undecidable manual Sg 10.76 0
IV.ACATE.HNZ. 2021-09-13T06:49:34.92 3.0 negative manual Pg 14.54 0
ST.ZIAN.EHZ. 2021-09-13T06:49:30.60 3.0 undecidable manual Sn -1.59 0
IT.LNT.HGZ. 2021-09-13T06:49:29.78 3.0 undecidable manual Pg 10.98 0
IV.ZEN8.EHZ. 2021-09-13T06:49:23.80 3.0 undecidable manual Sn 3.82 0
IV.QLNO.HHZ. 2021-09-13T06:49:20.65 3.0 undecidable manual Sn -1.04 0
IV.CPTP.HHZ. 2021-09-13T06:49:12.58 3.0 negative manual Pn -1.7 0
IV.NOCI.HHZ. 2021-09-13T06:49:07.31 3.0 negative manual Pg 11.24 0
CR.ZAG.BHZ. 2021-09-13T06:49:02.64 3.0 negative manual Pn 5.96 0
IV.ERC.EHZ. 2021-09-13T06:49:01.82 3.0 undecidable manual Pn -0.83 0
ST.CARE.HNZ. 2021-09-13T06:48:55.12 3.0 negative manual Pn 2.94 0
GU.MGRO.HHZ. 2021-09-13T06:48:53.34 3.0 negative manual Pg 7.54 0
IV.BRES.EHZ. 2021-09-13T06:48:52.37 3.0 undecidable manual Pn -1.86 0
GU.GSCL.HHZ. 2021-09-13T06:48:52.16 3.0 undecidable manual Sn -0.54 0
IV.SGAL.EHZ. 2021-09-13T06:48:49.73 3.0 negative manual Pg 7.43 0
IT.AVL.HNZ. 2021-09-13T06:48:40.10 3.0 negative manual Pg 4.66 0
IV.PP3.EHZ. 2021-09-13T06:48:35.87 3.0 undecidable manual Sn 0.14 0
IV.MTMR.EHZ. 2021-09-13T06:48:33.17 3.0 negative manual Pn -4 0
IV.VAGA.HHZ. 2021-09-13T06:48:32.34 3.0 undecidable manual Pg 5.65 0
IT.RMVT.HGZ. 2021-09-13T06:48:17.66 3.0 undecidable manual S -2.62 0
IV.FIR.HHZ. 2021-09-13T06:48:15.61 3.0 undecidable manual P -0.6 0
IV.MGAB.HHZ. 2021-09-13T06:48:11.63 0.3 undecidable manual S 304 0.3975 50 -0.16 69
IV.CSNT.HHZ. 2021-09-13T06:48:10.89 3.0 positive manual P -1.47 0
IV.NRCA.HHZ. 2021-09-13T06:48:06.16 0.3 positive manual P 70 0.4308 50 -0.05 70
IV.ARRO.EHZ. 2021-09-13T06:48:05.15 0.6 undecidable manual S 126 0.1871 114 0.05 49
IV.MGAB.HHZ. 2021-09-13T06:48:05.80 0.1 undecidable manual P 304 0.3975 50 0.18 92
IV.ASSB.HHZ. 2021-09-13T06:48:04.93 0.6 negative manual P 12 0.3597 50 -0.06 47
IT.GNU.HGE. 2021-09-13T06:48:02.72 0.6 undecidable manual S 4 0.1142 126 0.05 50
IV.ARRO.EHZ. 2021-09-13T06:48:02.06 1.0 positive manual P 126 0.1871 114 0.3 23
IV.GAVE.EHZ. 2021-09-13T06:48:02.70 1.0 undecidable manual P 89 0.2455 109 -0.26 23
IV.MOMA.HHZ. 2021-09-13T06:48:02.50 0.6 undecidable manual S 4 0.1142 126 -0.17 49
IV.CESX.HHZ. 2021-09-13T06:48:01.61 0.6 undecidable manual S 167 0.0836 135 -0.16 49
IV.MOMA.HHZ. 2021-09-13T06:48:00.44 0.1 negative manual P 4 0.1142 126 0.09 99
IT.GNU.HGE. 2021-09-13T06:48:00.38 0.1 undecidable manual P 4 0.1142 126 0.03 100
IV.CESX.HHZ. 2021-09-13T06:47:59.82 0.6 positive manual P 167 0.0836 135 -0.01 50
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHN. ML:1.1 0.0001485 0.22 AML other m 2021-09-13T06:48:02.46
IV.CESX.HHE. ML:1.2 0.000224 0.36 AML other m 2021-09-13T06:48:02.73
IV.CESX.HHN. ML:1.2 0.000236 0.54 AML other m 2021-09-13T06:48:02.97
IV.MOMA.HNE. ML:1.3 0.000225 1.04 AML other m 2021-09-13T06:48:03.18
IV.MOMA.HNN. ML:1.2 0.0001765 0.42 AML other m 2021-09-13T06:48:03.47
IV.MOMA.HHE. ML:1.3 0.0002285 0.28 AML other m 2021-09-13T06:48:03.78
IV.ARRO.EHE. ML:0.9 5.435E-5 0.2 AML other m 2021-09-13T06:48:05.52
IV.ARRO.EHN. ML:1 6.885E-5 1.8 AML other m 2021-09-13T06:48:07.95
IV.GAVE.EHN. ML:0.9 3.76E-5 0.42 AML other m 2021-09-13T06:48:08.31
IV.GAVE.EHE. ML:0.8 3.65E-5 1.22 AML other m 2021-09-13T06:48:10.81
IV.MGAB.HHE. ML:1.1 4.04E-5 0.5 AML other m 2021-09-13T06:48:12.59
IV.MGAB.HHN. ML:1.2 4.96E-5 0.62 AML other m 2021-09-13T06:48:13.82
IV.NRCA.HHN. ML:1.1 3.42E-5 0.14 AML other m 2021-09-13T06:48:14.05
IV.NRCA.HHE. ML:0.9 2.115E-5 0.12 AML other m 2021-09-13T06:48:15.42
IV.FIR.HNN. ML:3.1 0.0006065 1.04 AML other m 2021-09-13T06:48:31.38
IV.FIR.HHN. ML:3.2 0.0007065 0.36 AML other m 2021-09-13T06:48:32.24
IV.FIR.HHE. ML:3.1 0.000614 0.7 AML other m 2021-09-13T06:48:38.45
IV.FIR.HNE. ML:3 0.000522 0.7 AML other m 2021-09-13T06:48:38.45
GU.GSCL.HHN. ML:2.2 3.74E-5 0.86 AML other m 2021-09-13T06:49:23.47
GU.GSCL.HHE. ML:2.4 4.43E-5 0.22 AML other m 2021-09-13T06:49:24.36
IV.ZEN8.EHN. ML:3 7.655E-5 0.06 AML other m 2021-09-13T06:49:52.46
IV.ZEN8.EHE. ML:2.8 4.48E-5 0.66 AML other m 2021-09-13T06:49:53.35
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