Earthquake with magnitude of ML 1.1 on date 18-09-2021 and time 04:49:43 (Italy) in region 6 km NE Stroncone (TR)

A magnitude ML 1.1 earthquake occured in region: 6 km NE Stroncone (TR), on

  • 18-09-2021 02:49:43 (UTC)
  • 18-09-2021 04:49:43 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.536, 12.718 at 10 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
Stroncone TR 6 4917 4917
Terni TR 6 111501 116418
Colli sul Velino RI 7 533 116951
Arrone TR 7 2763 119714
Labro RI 7 374 120088
Montefranco TR 8 1276 121364
Morro Reatino RI 10 373 121737
Greccio RI 10 1558 123295
Ferentillo TR 11 1913 125208
Rivodutri RI 12 1253 126461
Polino TR 12 233 126694
Configni RI 14 633 127327
Poggio Bustone RI 14 2055 129382
Contigliano RI 15 3783 133165
Cottanello RI 15 563 133728
San Gemini TR 16 5018 138746
Narni TR 17 19785 158531
Montasola RI 17 395 158926
Cantalice RI 17 2755 161681
Vacone RI 18 256 161937
Rieti RI 19 47698 209635
Calvi dell'Umbria TR 19 1856 211491

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km E of Terni (111501 inhabitants)
47 Km S of Foligno (57155 inhabitants)
52 Km E of Viterbo (67173 inhabitants)
60 Km N of Guidonia Montecelio (88673 inhabitants)
60 Km W of L'Aquila (69753 inhabitants)
64 Km N of Tivoli (56533 inhabitants)
69 Km SE of Perugia (166134 inhabitants)
74 Km N of Roma (2864731 inhabitants)
82 Km W of Teramo (54892 inhabitants)
91 Km NE of Civitavecchia (52991 inhabitants)
94 Km NE of Fiumicino (78395 inhabitants)
95 Km N of Velletri (53303 inhabitants)
98 Km N of Pomezia (62966 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.1 2021-09-18
02:49:43
42.5365 12.7177 10 2021-09-18
02:54:08
Sala Sismica INGV-Roma 95564661
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-18 02:49:43 ± 0.13
Latitude 42.5365 ± 0.0063
Longitude 12.7177 ± 0.0073
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95564661

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 748
Semi-minor axis of confidence ellipse (meter) 499
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 25
Circular confidence region, given by single value of horizontal uncertainty (meter) 750
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 175
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
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) 0.05576
Epicentral distance of station farthest from the epicenter (degree) 0.90022
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 12
Type of magnitude ML
Reference to an origin 95564661
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-18 02:54:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2021-09-18T02:50:03.96 0.1 undecidable manual S 28 0.5684 50 0.52 82
IV.SSFR.HNZ. 2021-09-18T02:50:01.37 1.0 undecidable manual P 3 0.9002 50 0.51 19
IV.FIAM.HHZ. 2021-09-18T02:49:58.71 0.1 undecidable manual S 132 0.3984 50 0.3 90
IV.FDMO.HHZ. 2021-09-18T02:49:55.15 1.0 undecidable manual P 28 0.5684 50 -0.04 23
IV.MOMA.HHZ. 2021-09-18T02:49:55.18 0.1 undecidable manual S 338 0.2887 50 0.04 97
IV.LNSS.HHZ. 2021-09-18T02:49:53.56 0.1 undecidable manual S 74 0.2464 50 -0.34 92
IV.GAVE.EHZ. 2021-09-18T02:49:52.31 0.1 undecidable manual S 40 0.2023 114 -0.15 96
IV.NRCA.HHZ. 2021-09-18T02:49:52.49 1.0 negative manual P 44 0.4164 50 -0.09 23
IV.FIAM.HHZ. 2021-09-18T02:49:51.95 1.0 negative manual P 132 0.3984 50 -0.33 22
IV.MOMA.HHZ. 2021-09-18T02:49:50.04 0.6 negative manual P 338 0.2887 50 -0.35 45
IV.LNSS.HHZ. 2021-09-18T02:49:49.36 0.3 negative manual P 74 0.2464 50 -0.32 69
IV.CESX.HHZ. 2021-09-18T02:49:49.66 0.1 undecidable manual S 307 0.1205 127 -0.05 100
IV.GAVE.EHZ. 2021-09-18T02:49:48.68 0.1 undecidable manual P 40 0.2023 114 -0.17 96
IV.ARRO.EHZ. 2021-09-18T02:49:48.26 0.1 undecidable manual S 40 0.0558 149 0.26 97
IV.CESX.HHZ. 2021-09-18T02:49:47.15 0.3 negative manual P 307 0.1205 127 -0.1 74
IV.ARRO.EHZ. 2021-09-18T02:49:46.45 0.3 negative manual P 40 0.0558 149 0.18 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHN. ML:1 0.0001385 0.16 AML other m 2021-09-18T02:49:48.37
IV.ARRO.EHE. ML:1.1 0.0001795 0.66 AML other m 2021-09-18T02:49:48.43
IV.CESX.HHN. ML:0.9 7.715E-5 0.62 AML other m 2021-09-18T02:49:51.47
IV.CESX.HHE. ML:0.8 7.1E-5 0.98 AML other m 2021-09-18T02:49:51.44
IV.GAVE.EHN. ML:1 6.965E-5 0.1 AML other m 2021-09-18T02:49:52.66
IV.GAVE.EHE. ML:0.9 5.425E-5 0.96 AML other m 2021-09-18T02:49:54.05
IV.LNSS.HHE. ML:1.2 8.06E-5 0.2 AML other m 2021-09-18T02:49:54.57
IV.LNSS.HHN. ML:1.1 6.795E-5 0.2 AML other m 2021-09-18T02:49:54.80
IV.MOMA.HHN. ML:1 4.08E-5 0.52 AML other m 2021-09-18T02:49:55.46
IV.MOMA.HHE. ML:1.2 7.175E-5 0.9 AML other m 2021-09-18T02:49:56.57
IV.MMUR.HNE. ML:2.9 0.000776 0.4 AML other m 2021-09-18T02:50:02.26
IV.MMUR.HNN. ML:2.8 0.000565 0.46 AML other m 2021-09-18T02:50:02.33
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