Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 30-10-2021 and time 19:56:03 (Italy) in region 8 km W Arquata del Tronto (AP)

A magnitude ML 1.1 earthquake occured in region: 8 km W Arquata del Tronto (AP), on

  • 30-10-2021 17:56:03 (UTC)
  • 30-10-2021 19:56:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7650, 13.1990 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.

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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
Arquata del Tronto AP 8 1178 1178
Accumoli RI 9 667 1845
Norcia PG 9 4957 6802
Montegallo AP 14 523 7325
Castelsantangelo sul Nera MC 15 281 7606
Cascia PG 16 3217 10823
Cittareale RI 17 482 11305
Amatrice RI 17 2657 13962
Acquasanta Terme AP 17 2916 16878
Preci PG 18 724 17602
Montemonaco AP 18 604 18206

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km W of Teramo (54892 inhabitants)
46 Km E of Foligno (57155 inhabitants)
49 Km NW of L'Aquila (69753 inhabitants)
50 Km E of Terni (111501 inhabitants)
76 Km SE 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)
93 Km NE of Guidonia Montecelio (88673 inhabitants)
95 Km NE of Tivoli (56533 inhabitants)
97 Km E of Viterbo (67173 inhabitants)
98 Km S of Ancona (100861 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
Reviewed
Rev100 		ML 1.1 2021-10-30
17:56:03		 42.7648 13.1987 10 2021-10-30
18:06:17		 Sala Sismica INGV-Roma 97095751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-30 17:56:03 ± 0.08
Latitude 42.7648 ± 0.0036
Longitude 13.1987 ± 0.0049
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97095751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 373
Semi-minor axis of confidence ellipse (meter) 319
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 55
Circular confidence region, given by single value of horizontal uncertainty (meter) 370.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 102
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.09263
Epicentral distance of station farthest from the epicenter (degree) 0.33005
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 97095751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-30 18:06:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-10-30T17:56:15.96 0.6 undecidable manual S 115 36.6411 50 -0.49 44
IV.LNSS.HHZ. 2021-10-30T17:56:12.27 0.6 undecidable manual S 216 22.1556 114 -0.11 49
IV.TERO.HHZ. 2021-10-30T17:56:11.13 0.1 undecidable manual P 115 36.6411 50 -0.05 96
IV.SMA1.EHZ. 2021-10-30T17:56:11.48 0.6 undecidable manual S 143 18.5703 118 0.2 48
IV.MTRA.HNZ. 2021-10-30T17:56:10.42 0.6 undecidable manual S 93 16.1727 122 -0.12 49
IV.MF5.EHZ. 2021-10-30T17:56:10.88 0.3 undecidable manual P 41 32.5452 50 0.33 69
IV.MC2.EHZ. 2021-10-30T17:56:10.59 0.6 undecidable manual S 357 16.2726 121 0.01 50
IV.MMO1.HNZ. 2021-10-30T17:56:10.98 0.6 undecidable manual S 35 18.1707 119 -0.17 48
IV.SMA1.EHZ. 2021-10-30T17:56:08.28 0.6 undecidable manual P 143 18.5703 118 0.09 49
IV.LNSS.HHZ. 2021-10-30T17:56:08.83 0.1 undecidable manual P 216 22.1556 114 0 100
IV.MMO1.HNZ. 2021-10-30T17:56:08.09 0.1 undecidable manual P 35 18.1707 119 -0.03 100
IV.NRCA.HHZ. 2021-10-30T17:56:08.48 0.6 undecidable manual S 318 10.2786 134 -0.44 46
IV.MC2.EHZ. 2021-10-30T17:56:07.82 0.1 undecidable manual P 357 16.2726 121 0.04 100
IV.MTRA.HNZ. 2021-10-30T17:56:07.87 0.1 undecidable manual P 93 16.1727 122 0.11 99
IV.NRCA.HHZ. 2021-10-30T17:56:06.98 0.1 undecidable manual P 318 10.2786 134 0.16 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.3 0.00023582920000000002 0.064 AML other m 2021-10-30T17:56:09.05
IV.NRCA.HHN. ML:1.0 0.00013384345 0.0896 AML other m 2021-10-30T17:56:09.00
IV.LNSS.HHE. ML:0.5 0.000021930680000000002 0.1152 AML other m 2021-10-30T17:56:12.68
IV.LNSS.HHN. ML:0.5 0.0000197392 0.1792 AML other m 2021-10-30T17:56:12.70
IV.NRCA.HNE. ML:1.2 0.000212985 0.0768 AML other m 2021-10-30T17:56:09.09
IV.NRCA.HNN. ML:1.0 0.00013259831499999998 0.0768 AML other m 2021-10-30T17:56:09.54
IV.LNSS.HNE. ML:1.1 0.000085055315 0.3584 AML other m 2021-10-30T17:56:13.92
IV.LNSS.HNN. ML:1.5 0.00022323514999999998 0.7936 AML other m 2021-10-30T17:56:16.24
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