Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 06-04-2021 and time 12:56:25 (Italy) in region 8 km NW Arquata del Tronto (AP)

A magnitude ML 1.2 earthquake occured in region: 8 km NW Arquata del Tronto (AP), on

  • 06-04-2021 10:56:25 (UTC)
  • 06-04-2021 12:56:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8290, 13.2330 at 11 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
Montegallo AP 8 523 1701
Castelsantangelo sul Nera MC 10 281 1982
Montemonaco AP 11 604 2586
Norcia PG 12 4957 7543
Accumoli RI 15 667 8210
Ussita MC 15 444 8654
Montefortino FM 16 1178 9832
Acquasanta Terme AP 16 2916 12748
Visso MC 16 1107 13855
Preci PG 17 724 14579
Bolognola MC 19 142 14721
Amandola FM 20 3629 18350

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km W of Teramo (54892 inhabitants)
45 Km E of Foligno (57155 inhabitants)
55 Km N of L'Aquila (69753 inhabitants)
56 Km NE 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)
91 Km S of Ancona (100861 inhabitants)
93 Km NW of Chieti (51815 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 1.2 2021-04-06
10:56:25		 42.829 13.2328 11 2021-04-06
11:01:22		 Sala Sismica INGV-Roma 88824241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-06 10:56:25 ± 0.08
Latitude 42.8290 ± 0.0027
Longitude 13.2328 ± 0.0037
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88824241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 240
Semi-minor axis of confidence ellipse (meter) 238
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 329
Circular confidence region, given by single value of horizontal uncertainty (meter) 240.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 91
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.08
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.32016
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 25
Type of magnitude ML
Reference to an origin 88824241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-06 11:01:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-04-06T10:56:33.24 3.0 negative manual Pg 0.77 0
IV.MTRA.HNZ. 2021-04-06T10:56:32.57 0.6 undecidable manual S 121 15.5733 125 0.15 49
IV.CAMP.HHN. 2021-04-06T10:56:32.64 0.6 undecidable manual P 156 35.5422 50 -0.15 47
IV.RM33.EHZ. 2021-04-06T10:56:32.70 0.3 undecidable manual P 182 35.5422 50 -0.09 72
IV.CESI.HHZ. 2021-04-06T10:56:31.92 3.0 positive manual P -0.13 0
IV.CSP1.EHZ. 2021-04-06T10:56:31.26 3.0 positive manual Pg 0.04 0
IV.LNSS.HHZ. 2021-04-06T10:56:31.91 3.0 positive manual P -0.11 0
IV.MC2.EHZ. 2021-04-06T10:56:31.08 0.6 undecidable manual S 339 9.7791 138 0.16 49
IV.MMO1.EHZ. 2021-04-06T10:56:31.18 0.6 undecidable manual S 44 10.878 135 0 50
IV.MF5.EHZ. 2021-04-06T10:56:31.35 3.0 undecidable manual P 0.68 0
IV.T1299.HNZ. 2021-04-06T10:56:30.72 0.1 undecidable manual P 169 21.9669 50 0.02 97
IV.SMA1.EHZ. 2021-04-06T10:56:30.82 0.1 positive manual P 159 23.5542 50 -0.12 97
IV.NRCA.HNZ. 2021-04-06T10:56:30.87 0.6 undecidable manual S 273 9.6792 138 -0.01 50
IV.FDMO.HHZ. 2021-04-06T10:56:30.70 3.0 undecidable manual Pn -0.34 0
IV.MTRA.HNZ. 2021-04-06T10:56:29.66 0.6 undecidable manual P 121 15.5733 125 0.01 50
IV.MC2.EHZ. 2021-04-06T10:56:28.85 1.0 negative manual P 339 9.7791 138 0.07 25
IV.NRCA.HNZ. 2021-04-06T10:56:28.77 0.3 undecidable manual P 273 9.6792 138 0.01 76
IV.MMO1.EHZ. 2021-04-06T10:56:28.88 0.1 undecidable manual P 44 10.878 135 -0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHN. ML:1.2 0.00008837053 0.2624 AML other m 2021-04-06T10:56:34.74
IV.FDMO.HHE. ML:1.1 0.00007204007 0.1984 AML other m 2021-04-06T10:56:34.77
IV.SMA1.EHN. ML:1.0 0.000058344210000000004 0.1024 AML other m 2021-04-06T10:56:35.57
IV.SMA1.EHE. ML:1.1 0.000079111905 0.2176 AML other m 2021-04-06T10:56:34.92
IV.TERO.HHE. ML:1.3 0.00007305 1.88 AML other m 2021-04-06T10:56:38.95
IV.TERO.HHN. ML:1.3 0.00008165 0.08 AML other m 2021-04-06T10:56:39.00
IV.MTRA.EHE. ML:1.2 0.00016186990000000001 0.0768 AML other m 2021-04-06T10:56:32.69
IV.MTRA.EHN. ML:1.3 0.0001684803 0.2048 AML other m 2021-04-06T10:56:32.53
IV.MTRA.HNE. ML:1.3 0.00018252135 0.0896 AML other m 2021-04-06T10:56:32.68
IV.MTRA.HNN. ML:1.3 0.00016872865000000002 0.1984 AML other m 2021-04-06T10:56:32.86
IV.CSP1.EHE. ML:1.1 0.00006327497999999999 0.2176 AML other m 2021-04-06T10:56:36.00
IV.CSP1.EHN. ML:1.3 0.00010420838000000002 0.1984 AML other m 2021-04-06T10:56:37.70
IV.MF5.EHN. ML:1.3 0.00011345779000000001 1.6576 AML other m 2021-04-06T10:56:48.43
IV.LNSS.HHE. ML:1.2 0.00006967049 0.1408 AML other m 2021-04-06T10:56:37.23
IV.LNSS.HHN. ML:1.0 0.00004461915 0.2048 AML other m 2021-04-06T10:56:36.96
IV.LNSS.HNE. ML:1.4 0.000115731905 0.7552 AML other m 2021-04-06T10:56:47.69
IV.LNSS.HNN. ML:1.5 0.000141855895 0.768 AML other m 2021-04-06T10:56:42.87
IV.CESI.HHE. ML:1.0 0.000038935015 0.16 AML other m 2021-04-06T10:56:37.48
IV.CESI.HHN. ML:1.2 0.000067096055 0.16 AML other m 2021-04-06T10:56:37.60
IV.RM33.HNE. ML:1.6 0.0001758229 0.9088 AML other m 2021-04-06T10:56:42.93
IV.RM33.HNN. ML:1.4 0.00010018874 0.7232 AML other m 2021-04-06T10:56:52.31
IV.RM33.EHE. ML:0.9 0.000032076915 0.1024 AML other m 2021-04-06T10:56:39.06
IV.RM33.EHN. ML:0.8 0.0000249048525 0.1408 AML other m 2021-04-06T10:56:39.76
IV.TERO.HNE. ML:1.4 0.000090576885 0.6272 AML other m 2021-04-06T10:56:46.34
IV.TERO.HNN. ML:1.6 0.000143992275 0.8064 AML other m 2021-04-06T10:56:51.64
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