Earthquake with magnitude of ML 1.4 on date 20-09-2021 and time 03:00:19 (Italy) in region 8 km W Arquata del Tronto (AP)

A magnitude ML 1.4 earthquake occured in region: 8 km W Arquata del Tronto (AP), on

  • 20-09-2021 01:00:19 (UTC)
  • 20-09-2021 03:00:19 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.789, 13.206 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
Arquata del Tronto AP 8 1178 1178
Norcia PG 9 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 17 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 19 482 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)
52 Km E of Terni (111501 inhabitants)
75 Km E of Perugia (166134 inhabitants)
83 Km W of Montesilvano (53738 inhabitants)
90 Km W of Pescara (121014 inhabitants)
93 Km NW of Chieti (51815 inhabitants)
96 Km S of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km NE of Tivoli (56533 inhabitants)
99 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 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 1.4 2021-09-20
01:00:19
42.7892 13.2065 9 2021-09-20
01:06:35
Sala Sismica INGV-Roma 95645311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-20 01:00:19 ± 0.05
Latitude 42.7892 ± 0.0027
Longitude 13.2065 ± 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 95645311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 411
Semi-minor axis of confidence ellipse (meter) 154
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 286
Circular confidence region, given by single value of horizontal uncertainty (meter) 410
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 57
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.3939
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 95645311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-20 01:06:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SACS.HHZ. 2021-09-20T01:00:41.28 3.0 undecidable manual P 2.47 0
IV.CESI.HHZ. 2021-09-20T01:00:31.26 0.3 undecidable manual S 314 0.3085 50 -0.11 72
IV.CSP1.EHZ. 2021-09-20T01:00:31.03 0.3 undecidable manual S 360 0.3022 50 -0.15 71
IV.RM33.EHZ. 2021-09-20T01:00:30.29 0.3 undecidable manual S 179 0.2797 50 -0.22 70
IV.MF5.EHZ. 2021-09-20T01:00:30.36 0.3 undecidable manual S 43 0.2716 50 0.09 72
IV.GAVE.EHZ. 2021-09-20T01:00:29.31 0.3 undecidable manual S 247 0.2491 109 -0.16 72
IV.LNSS.HHZ. 2021-09-20T01:00:28.55 0.3 undecidable manual S 213 0.223 111 0.03 74
IV.MNTT.EHZ. 2021-09-20T01:00:28.45 0.3 undecidable manual P 46 0.3939 50 0.7 60
IV.CESI.HHZ. 2021-09-20T01:00:26.31 0.3 undecidable manual P 314 0.3085 50 0.02 73
IV.MMO1.EHZ. 2021-09-20T01:00:25.40 0.1 undecidable manual S 39 0.1412 121 -0.27 95
IV.MF5.EHZ. 2021-09-20T01:00:25.79 0.1 undecidable manual P 43 0.2716 50 0.13 96
IV.RM33.EHZ. 2021-09-20T01:00:25.79 0.1 undecidable manual P 179 0.2797 50 -0.01 98
IV.GAVE.EHZ. 2021-09-20T01:00:25.22 0.6 undecidable manual P 247 0.2491 109 0.02 49
IV.MC2.EHZ. 2021-09-20T01:00:25.22 0.3 undecidable manual S 354 0.1232 124 0.14 74
IV.CSP1.EHZ. 2021-09-20T01:00:25.90 0.1 undecidable manual P 360 0.3022 50 -0.28 92
IV.LNSS.HHZ. 2021-09-20T01:00:24.78 0.1 undecidable manual P 213 0.223 111 0.13 96
IV.T1299.EHE. 2021-09-20T01:00:23.67 0.1 undecidable manual P 160 0.1646 117 0.21 96
IV.NRCA.HHZ. 2021-09-20T01:00:23.73 0.1 undecidable manual S 303 0.0809 136 -0.11 100
IV.SMA1.EHZ. 2021-09-20T01:00:23.80 0.1 undecidable manual P 149 0.1844 114 -0.06 99
IV.NRCA.HHZ. 2021-09-20T01:00:22.15 0.1 undecidable manual P 303 0.0809 136 0.2 98
IV.MC2.EHZ. 2021-09-20T01:00:22.84 0.1 undecidable manual P 354 0.1232 124 0.18 97
IV.MMO1.EHZ. 2021-09-20T01:00:22.97 0.1 undecidable manual P 39 0.1412 121 -0.04 100
IV.MTRA.HNE. 2021-09-20T01:00:22.41 0.6 undecidable manual P 103 0.143 120 -0.63 43
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.6 0.000565 1.32 AML other m 2021-09-20T01:00:24.10
IV.NRCA.HHN. ML:1.6 0.0005145 0.16 AML other m 2021-09-20T01:00:24.87
IV.SMA1.EHN. ML:1.2 0.0001155 0.42 AML other m 2021-09-20T01:00:25.54
IV.CESI.HHE. ML:1.1 5.585E-5 0.42 AML other m 2021-09-20T01:00:28.57
IV.LNSS.HHN. ML:1.3 0.0001255 1.08 AML other m 2021-09-20T01:00:29.07
IV.LNSS.HHE. ML:1.4 0.0001725 0.44 AML other m 2021-09-20T01:00:29.66
IV.GAVE.EHE. ML:1.2 8.915E-5 0.96 AML other m 2021-09-20T01:00:29.40
IV.GAVE.EHN. ML:1.2 9.365E-5 0.96 AML other m 2021-09-20T01:00:29.51
IV.MNTT.EHE. ML:2.3 0.0006435 0.42 AML other m 2021-09-20T01:00:31.66
IV.SMA1.EHE. ML:1.2 0.0001325 0.42 AML other m 2021-09-20T01:00:33.23
IV.CESI.HHN. ML:1.3 8.945E-5 0.42 AML other m 2021-09-20T01:00:34.32
IV.MNTT.EHN. ML:2.2 0.000457 1.54 AML other m 2021-09-20T01:00:37.84
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