Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 20-04-2020 and time 13:00:56 (Italy) in region 6 km W Arquata del Tronto (AP)

A magnitude ML 1.8 earthquake occured in region: 6 km W Arquata del Tronto (AP), on

  • 20-04-2020 11:00:56 (UTC)
  • 20-04-2020 13:00:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7710, 13.2290 at 11 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 6 1178 1178
Accumoli RI 9 667 1845
Norcia PG 11 4957 6802
Montegallo AP 12 523 7325
Acquasanta Terme AP 15 2916 10241
Castelsantangelo sul Nera MC 15 281 10522
Amatrice RI 16 2657 13179
Montemonaco AP 17 604 13783
Cittareale RI 18 482 14265
Cascia PG 19 3217 17482
Preci PG 20 724 18206

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km W of Teramo (54892 inhabitants)
48 Km E of Foligno (57155 inhabitants)
49 Km N of L'Aquila (69753 inhabitants)
53 Km E of Terni (111501 inhabitants)
78 Km E of Perugia (166134 inhabitants)
81 Km W of Montesilvano (53738 inhabitants)
88 Km W of Pescara (121014 inhabitants)
90 Km NW of Chieti (51815 inhabitants)
95 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km NE of Tivoli (56533 inhabitants)
97 Km S of Ancona (100861 inhabitants)
100 Km E of Viterbo (67173 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
Bulletin
Rev1000 		ML 1.8 2020-04-20
11:00:56		 42.7712 13.2293 11 2020-07-18
21:08:36		 Bollettino Sismico Italiano INGV 78965121
Reviewed
Rev100 		ML 1.8 2020-04-20
11:00:56		 42.7738 13.2298 13 2020-04-20
11:16:32		 Sala Sismica INGV-Roma 78413341
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-04-20 11:00:56 ± 0.05
Latitude 42.7712 ± 0.0027
Longitude 13.2293 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 78965121

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 364
Semi-minor axis of confidence ellipse (meter) 112
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 56
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 54
Number of associated phases, regardless of their use for origin computation 45
Number of defining phases 45
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) 0.10522
Epicentral distance of station farthest from the epicenter (degree) 2.35442
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 32
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 28
Type of magnitude ML
Reference to an origin 78965121
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-05-09 00:23:53

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 78413341
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-04-20 11:16:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
OT.OT13.EHZ. 2020-04-20T11:01:35.32 0.3 undecidable manual P 111 261.3384 54 -0.17 28
IV.FAGN.HHZ. 2020-04-20T11:01:16.17 0.6 undecidable manual S 153 63.0924 90 0.52 42
IV.FIAM.HNN. 2020-04-20T11:01:14.14 0.3 undecidable manual S 189 56.5989 90 0.24 67
IV.MOMA.HHZ. 2020-04-20T11:01:13.52 0.1 undecidable manual S 274 53.8017 90 0.36 87
IV.MML1.HNE. 2020-04-20T11:01:10.29 0.6 undecidable manual S 331 43.3233 90 -0.09 47
IV.GIGS.HHZ. 2020-04-20T11:01:10.60 0.1 undecidable manual S 141 45.0216 90 -0.23 91
IV.T0110.HHZ. 2020-04-20T11:01:09.54 0.3 undecidable manual P 143 74.8695 90 0.23 65
IV.CSP1.EHE. 2020-04-20T11:01:08.22 0.6 undecidable manual S 357 35.6421 90 -0.1 47
IV.CESI.HHZ. 2020-04-20T11:01:08.56 0.1 undecidable manual S 315 37.0296 90 -0.12 94
IV.GUMA.HHZ. 2020-04-20T11:01:07.84 0.1 undecidable manual S 15 33.4443 90 0.1 96
IV.TERO.HHZ. 2020-04-20T11:01:07.79 0.1 undecidable manual S 118 34.743 90 -0.28 91
IV.ATCC.EHZ. 2020-04-20T11:01:07.84 0.3 undecidable manual P 314 66.2781 90 -0.15 67
IV.EL6.EHZ. 2020-04-20T11:01:07.41 0.1 positive manual P 351 62.7927 90 -0.03 92
IV.VCEL.EHZ. 2020-04-20T11:01:07.81 0.3 undecidable manual P 130 65.0904 90 0.01 69
IV.FAGN.HHZ. 2020-04-20T11:01:07.61 0.1 undecidable manual P 153 63.0924 90 0.12 90
IV.CESX.HHZ. 2020-04-20T11:01:06.41 0.3 undecidable manual P 251 55.4001 90 0.1 69
IV.FIAM.HNN. 2020-04-20T11:01:06.42 0.3 undecidable manual P 189 56.5989 90 -0.06 69
IT.GNU.HGE. 2020-04-20T11:01:06.23 1.0 undecidable manual P 274 53.8017 90 0.18 23
IV.FDMO.HHZ. 2020-04-20T11:01:06.98 0.3 undecidable manual S 339 31.6461 90 -0.26 69
IV.MOMA.HHZ. 2020-04-20T11:01:06.03 0.1 positive manual P 274 53.8017 90 -0.03 94
IV.SNTG.HHZ. 2020-04-20T11:01:06.97 1.0 undecidable manual P 337 58.5969 90 0.18 22
IT.TRN1.HGZ. 2020-04-20T11:01:05.99 0.6 undecidable manual P 244 53.1024 90 0.04 47
IV.MNTT.EHZ. 2020-04-20T11:01:05.47 0.1 undecidable manual P 43 43.9227 90 0.94 73
IV.SAP2.EHE. 2020-04-20T11:01:04.29 0.1 undecidable manual P 21 38.628 90 0.56 85
IV.MML1.HNE. 2020-04-20T11:01:04.36 0.1 positive manual P 331 43.3233 90 -0.09 94
IV.GIGS.HHZ. 2020-04-20T11:01:04.49 0.1 undecidable manual P 141 45.0216 90 -0.22 91
IV.MC2.EHZ. 2020-04-20T11:01:03.16 0.6 undecidable manual S 348 15.873 90 0.11 49
IV.CESI.HHZ. 2020-04-20T11:01:03.26 0.1 undecidable manual P 315 37.0296 90 -0.21 93
IV.CSP1.EHE. 2020-04-20T11:01:03.08 0.1 negative manual P 357 35.6421 90 -0.18 93
IV.GUMA.HHZ. 2020-04-20T11:01:03.20 0.1 positive manual P 15 33.4443 90 0.27 92
IV.FDMO.HHZ. 2020-04-20T11:01:02.42 0.1 negative manual P 339 31.6461 90 -0.22 94
IV.RM33.EHZ. 2020-04-20T11:01:02.24 0.1 positive manual P 182 29.1486 90 -0.01 98
IV.MF5.EHZ. 2020-04-20T11:01:02.49 0.1 positive manual P 38 30.4473 90 0.03 98
IV.TERO.HHZ. 2020-04-20T11:01:02.87 0.1 positive manual P 118 34.743 90 -0.24 92
IT.MTCL.HGZ. 2020-04-20T11:01:02.34 0.1 positive manual P 323 30.9468 90 -0.2 94
IV.MTRA.EHZ. 2020-04-20T11:01:02.30 0.3 undecidable manual S 97 13.6752 92 -0.16 73
IV.NRCA.HNZ. 2020-04-20T11:01:01.70 0.3 undecidable manual S 307 11.6772 110 -0.23 74
IV.LNSS.HHZ. 2020-04-20T11:01:01.52 0.1 positive manual P 220 24.1536 90 0.02 98
IV.CAMP.HHE. 2020-04-20T11:01:01.97 0.1 undecidable manual P 151 29.9478 90 -0.41 90
IV.FEMA.HNZ. 2020-04-20T11:01:01.66 0.1 positive manual P 325 25.752 90 -0.07 97
IV.MC2.EHZ. 2020-04-20T11:01:00.29 0.1 negative manual P 348 15.873 90 0.07 99
IV.T1299.HNZ. 2020-04-20T11:01:00.56 0.3 undecidable manual P 164 15.7731 90 0.36 70
IV.MMO1.EHZ. 2020-04-20T11:01:00.25 0.1 negative manual P 29 16.2726 90 -0.03 100
IV.MTRA.EHZ. 2020-04-20T11:00:59.91 0.1 positive manual P 97 13.6752 92 0.03 100
IV.NRCA.HNZ. 2020-04-20T11:00:59.65 0.1 negative manual P 307 11.6772 110 0.08 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:2.4 0.002735 0.16 AML other m 2020-04-20T11:01:01.93
IV.NRCA.HNE. ML:2.4 0.002505 0.16 AML other m 2020-04-20T11:01:01.85
IV.NRCA.HHN. ML:2.4 0.002915 0.16 AML other m 2020-04-20T11:01:01.89
IV.NRCA.HNN. ML:2.4 0.00269 0.16 AML other m 2020-04-20T11:01:01.89
IV.MTRA.HNE. ML:2.0 0.001015 0.44 AML other m 2020-04-20T11:01:02.45
IV.MTRA.EHE. ML:2.0 0.0010205 0.44 AML other m 2020-04-20T11:01:02.45
IV.MTRA.EHN. ML:2.0 0.000951 0.4 AML other m 2020-04-20T11:01:02.74
IV.MTRA.HNN. ML:2.0 0.0009495 0.4 AML other m 2020-04-20T11:01:02.74
IV.LNSS.HHN. ML:1.9 0.00043100000000000007 1.46 AML other m 2020-04-20T11:01:06.19
IV.LNSS.HHE. ML:1.8 0.0003465 0.44 AML other m 2020-04-20T11:01:06.81
IV.RM33.EHN. ML:1.8 0.000305 0.24 AML other m 2020-04-20T11:01:07.05
IV.FDMO.HHE. ML:1.4 0.0001115 0.4 AML other m 2020-04-20T11:01:07.67
IV.FDMO.HHN. ML:1.6 0.00019250000000000002 1.06 AML other m 2020-04-20T11:01:07.33
IV.RM33.EHE. ML:1.7 0.00023649999999999998 1.38 AML other m 2020-04-20T11:01:07.96
IV.TERO.HHN. ML:1.7 0.0001875 0.08 AML other m 2020-04-20T11:01:08.11
IV.MF5.EHE. ML:1.8 0.000288 1.48 AML other m 2020-04-20T11:01:08.17
IV.MF5.EHN. ML:1.6 0.0001985 0.4 AML other m 2020-04-20T11:01:08.19
IV.GUMA.HHE. ML:2.4 0.001048 0.22 AML other m 2020-04-20T11:01:08.78
IV.GUMA.HHN. ML:2.3 0.0008089999999999999 0.4 AML other m 2020-04-20T11:01:08.87
IV.TERO.HHE. ML:1.6 0.0001515 0.64 AML other m 2020-04-20T11:01:09.15
IV.CESI.HHE. ML:1.7 0.00016849999999999998 0.32 AML other m 2020-04-20T11:01:09.16
IV.CESI.HHN. ML:1.8 0.00026000000000000003 1 AML other m 2020-04-20T11:01:09.91
IV.GIGS.HHN. ML:0.9 0.00002685 0.08 AML other m 2020-04-20T11:01:11.52
IV.GIGS.HHE. ML:0.9 0.000024 0.84 AML other m 2020-04-20T11:01:13.05
IV.MNTT.EHN. ML:2.0 0.0002935 0.68 AML other m 2020-04-20T11:01:14.08
IV.MOMA.HHN. ML:1.5 0.00008044999999999999 0.3 AML other m 2020-04-20T11:01:14.72
IV.MOMA.HHE. ML:1.7 0.000129 1.86 AML other m 2020-04-20T11:01:14.96
IV.ARVD.HHE. ML:1.2 0.0000196 0.56 AML other m 2020-04-20T11:01:15.89
IV.ARVD.HHN. ML:1.2 0.000019299999999999998 0.46 AML other m 2020-04-20T11:01:16.41
IV.SNTG.HHE. ML:1.2 0.000029150000000000004 0.22 AML other m 2020-04-20T11:01:16.51
IV.SNTG.HHN. ML:1.2 0.0000299 1.56 AML other m 2020-04-20T11:01:18.05
IV.MNTT.EHE. ML:1.9 0.000242 1.56 AML other m 2020-04-20T11:01:18.05
IV.VCEL.EHN. ML:1.7 0.0000935 0.22 AML other m 2020-04-20T11:01:20.37
IV.T0110.HHE. ML:1.5 0.0000432 1.48 AML other m 2020-04-20T11:01:21.03
IV.VCEL.EHE. ML:1.6 0.00007125000000000001 1.36 AML other m 2020-04-20T11:01:21.24
IV.T0110.HHN. ML:1.5 0.0000443 0.44 AML other m 2020-04-20T11:01:25.12
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