Earthquake with magnitude of ML 0.9 on date 20-11-2021 and time 14:54:51 (Italy) in region 7 km W Arquata del Tronto (AP)

A magnitude ML 0.9 earthquake occured in region: 7 km W Arquata del Tronto (AP), on

  • 20-11-2021 13:54:51 (UTC)
  • 20-11-2021 14:54:51 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.791, 13.211 at 12 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
Arquata del Tronto AP 7 1178 1178
Norcia PG 10 4957 6135
Accumoli RI 11 667 6802
Montegallo AP 12 523 7325
Castelsantangelo sul Nera MC 13 281 7606
Montemonaco AP 16 604 8210
Acquasanta Terme AP 16 2916 11126
Preci PG 17 724 11850
Cascia PG 18 3217 15067
Ussita MC 18 444 15511
Visso MC 19 1107 16618
Amatrice RI 19 2657 19275
Cittareale RI 20 482 19757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km W of Teramo (54892 inhabitants)
45 Km E of Foligno (57155 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
53 Km E of Terni (111501 inhabitants)
76 Km E of Perugia (166134 inhabitants)
83 Km W of Montesilvano (53738 inhabitants)
90 Km W of Pescara (121014 inhabitants)
92 Km NW of Chieti (51815 inhabitants)
95 Km S of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km NE of Tivoli (56533 inhabitants)
100 Km E of Viterbo (67173 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 0.9 2021-11-20
13:54:51
42.7907 13.2113 12 2021-11-20
14:07:39
Sala Sismica INGV-Roma 97629461
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-20 13:54:51 ± 0.08
Latitude 42.7907 ± 0.0027
Longitude 13.2113 ± 0.0061
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97629461

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 460
Semi-minor axis of confidence ellipse (meter) 85
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 257
Circular confidence region, given by single value of horizontal uncertainty (meter) 460
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 87
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.28149
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 97629461
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-20 14:07:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
OX.CLUD.HHZ. 2021-11-20T13:56:33.22 3.0 undecidable manual Sg 13.05 0
IV.ZEN8.EHZ. 2021-11-20T13:56:26.95 3.0 undecidable manual Sg 16.690001 0
IV.CMPR.HHZ. 2021-11-20T13:56:21.46 3.0 undecidable manual Sg 5.47 0
IV.ERC.EHZ. 2021-11-20T13:56:11.18 3.0 undecidable manual Pg 10.37 0
IV.GIZZ.HHZ. 2021-11-20T13:56:07.82 3.0 positive manual Pg 9.97 0
IV.RESU.HHZ. 2021-11-20T13:56:06.99 3.0 positive manual Pn -0.18 0
SL.LJU.BHZ. 2021-11-20T13:56:06.42 3.0 undecidable manual Sn -9.2 0
IV.MTMR.EHZ. 2021-11-20T13:56:04.05 3.0 undecidable manual Sg 3.28 0
AC.VLO.HHZ. 2021-11-20T13:56:04.49 3.0 undecidable manual Pn -4.6 0
IV.IMTC.HHZ. 2021-11-20T13:55:59.98 3.0 undecidable manual Sg 4.55 0
IV.ILOS.HNZ. 2021-11-20T13:55:55.86 3.0 negative manual Pn -2.98 0
IV.RAVA.EHZ. 2021-11-20T13:55:49.70 3.0 undecidable manual Sn 1.09 0
IV.MRB1.HHZ. 2021-11-20T13:55:47.46 3.0 undecidable manual Sn -8.98 0
IV.PIGN.HHZ. 2021-11-20T13:55:43.63 3.0 undecidable manual Sn -3.19 0
IV.MTSN.HHZ. 2021-11-20T13:55:38.37 3.0 negative manual Pn -2.14 0
IX.CLT3.EHZ.02 2021-11-20T13:55:34.39 3.0 negative manual Pg 2.95 0
IV.BOZZ.HNZ. 2021-11-20T13:55:27.36 3.0 undecidable manual Pn -2.1 0
IV.LAV9.HHZ. 2021-11-20T13:55:27.34 3.0 undecidable manual Sn -1.89 0
IV.VENL.EHZ. 2021-11-20T13:55:24.58 3.0 positive manual Pn -1.04 0
IV.CFMN.HHZ. 2021-11-20T13:55:22.32 3.0 undecidable manual Pn -2.67 0
IV.FAGN.HHZ. 2021-11-20T13:55:14.33 3.0 undecidable manual Sn -4.56 0
IV.PE3.EHZ. 2021-11-20T13:55:11.81 3.0 undecidable manual Sn -1.72 0
IV.RM33.EHE. 2021-11-20T13:55:02.38 0.3 undecidable manual S 180 0.2815 94 0.18 71
IV.FDMO.HHZ. 2021-11-20T13:55:01.48 0.3 undecidable manual S 340 0.2617 95 -0.14 71
IV.LNSS.HHZ. 2021-11-20T13:55:00.67 0.3 undecidable manual S 214 0.2257 96 0.11 73
IV.SMA1.EHE. 2021-11-20T13:54:59.28 0.3 undecidable manual S 150 0.1844 100 -0.05 73
IV.PP3.EHZ. 2021-11-20T13:54:59.63 3.0 positive manual Pg -1.18 0
IV.ARVD.HHZ. 2021-11-20T13:54:58.47 3.0 undecidable manual P 0.81 0
IV.MTRA.EHZ. 2021-11-20T13:54:57.98 0.3 undecidable manual S 104 0.1403 109 -0.09 74
IV.RM33.EHE. 2021-11-20T13:54:57.20 0.1 undecidable manual P 180 0.2815 94 -0.43 88
IV.MMO1.EHZ. 2021-11-20T13:54:57.92 0.1 undecidable manual S 38 0.1376 110 -0.08 99
IV.MC2.EHZ. 2021-11-20T13:54:57.79 0.3 undecidable manual S 352 0.1214 115 0.22 71
IV.FDMO.HHZ. 2021-11-20T13:54:57.23 1.0 undecidable manual P 340 0.2617 95 -0.07 24
IV.NRCA.HHZ. 2021-11-20T13:54:56.38 0.6 undecidable manual S 301 0.0827 132 -0.23 48
IV.SMA1.EHE. 2021-11-20T13:54:56.23 0.3 undecidable manual P 150 0.1844 100 0.25 71
IV.LNSS.HHZ. 2021-11-20T13:54:56.83 0.3 negative manual P 214 0.2257 96 0.14 72
IV.MC2.EHZ. 2021-11-20T13:54:55.12 0.6 negative manual P 352 0.1214 115 0.16 48
IV.MTRA.EHZ. 2021-11-20T13:54:55.30 1.0 negative manual P 104 0.1403 109 0.06 25
IV.MMO1.EHZ. 2021-11-20T13:54:55.21 0.1 undecidable manual P 38 0.1376 110 0 99
IV.NRCA.HHZ. 2021-11-20T13:54:54.47 0.1 negative manual P 301 0.0827 132 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.4 0.00027425625 0.0576 AML other m 2021-11-20T13:54:56.48
IV.NRCA.HHN. ML:1.2 0.00020439095 0.1408 AML other m 2021-11-20T13:54:56.49
IV.NRCA.HNE. ML:1.4 0.00025400515 0.0704 AML other m 2021-11-20T13:54:56.51
IV.NRCA.HNN. ML:1.2 0.00019323565 0.096 AML other m 2021-11-20T13:54:56.94
IV.MC2.EHE. ML:0.7 4.915615E-5 0.16 AML other m 2021-11-20T13:54:59.52
IV.MC2.EHN. ML:1 9.63261E-5 0.2432 AML other m 2021-11-20T13:54:58.61
IV.MTRA.EHE. ML:0.4 2.18473785E-5 0.16 AML other m 2021-11-20T13:54:57.00
IV.MTRA.EHN. ML:0.4 1.82988955E-5 0.096 AML other m 2021-11-20T13:54:58.00
IV.LNSS.HHE. ML:0.6 1.98974935E-5 0.1216 AML other m 2021-11-20T13:55:00.83
IV.LNSS.HHN. ML:0.6 2.3612185E-5 0.256 AML other m 2021-11-20T13:55:00.73
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