Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.5 on date 27-08-2020 and time 04:07:57 (UTC) in region 7 km W Arquata del Tronto (AP)

A magnitude ML 0.5 earthquake occured in region: 7 km W Arquata del Tronto (AP), on

  • 27-08-2020 04:07:57 (UTC)
  • 27-08-2020 06:07:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7570, 13.2140 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 7 1178 1178
Accumoli RI 7 667 1845
Norcia PG 11 4957 6802
Montegallo AP 14 523 7325
Amatrice RI 15 2657 9982
Cittareale RI 16 482 10464
Acquasanta Terme AP 16 2916 13380
Castelsantangelo sul Nera MC 16 281 13661
Cascia PG 17 3217 16878
Montemonaco AP 19 604 17482
Preci PG 20 724 18206

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km W of Teramo (54892 inhabitants)
47 Km E of Foligno (57155 inhabitants)
48 Km NW of L'Aquila (69753 inhabitants)
51 Km E of Terni (111501 inhabitants)
78 Km SE 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)
93 Km NE of Guidonia Montecelio (88673 inhabitants)
95 Km NE of Tivoli (56533 inhabitants)
98 Km E of Viterbo (67173 inhabitants)
99 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 0.5 2020-08-27
04:07:57		 42.7567 13.2142 11 2020-08-27
05:11:08		 Sala Sismica INGV-Roma 82363041
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-27 04:07:57 ± 0.13
Latitude 42.7567 ± 0.0063
Longitude 13.2142 ± 0.0159
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 82363041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1388
Semi-minor axis of confidence ellipse (meter) 246
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 68
Circular confidence region, given by single value of horizontal uncertainty (meter) 1390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 163
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.29498
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.3
Num. used stations 9
Type of magnitude ML
Reference to an origin 82363041
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-27 05:11:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2020-08-27T04:08:09.15 0.1 undecidable manual S 342 32.745 50 0.01 98
IV.RM33.EHZ. 2020-08-27T04:08:07.68 0.1 undecidable manual S 180 27.4503 50 -0.06 98
IV.LNSS.HHZ. 2020-08-27T04:08:05.99 0.1 undecidable manual S 220 22.1556 50 -0.34 93
IV.FDMO.HHZ. 2020-08-27T04:08:04.24 0.1 undecidable manual P 342 32.745 50 -0.13 96
IV.SMA1.EHZ. 2020-08-27T04:08:04.76 0.1 undecidable manual S 145 17.1717 122 -0.08 99
IV.RM33.EHZ. 2020-08-27T04:08:03.47 0.1 undecidable manual P 180 27.4503 50 -0.09 97
IV.NRCA.HHZ. 2020-08-27T04:08:03.22 0.1 undecidable manual S 316 11.7771 132 -0.14 99
IV.T1299.EHZ. 2020-08-27T04:08:03.19 3.0 undecidable manual S 0
IV.LNSS.HHZ. 2020-08-27T04:08:03.57 0.1 undecidable manual P 220 22.1556 50 0.82 79
IV.NRCA.HHZ. 2020-08-27T04:08:01.13 0.1 undecidable manual P 316 11.7771 132 0.1 100
IV.SMA1.EHZ. 2020-08-27T04:08:01.94 0.1 undecidable manual P 145 17.1717 122 0.05 100
IV.T1299.EHZ. 2020-08-27T04:07:59.85 3.0 undecidable manual P 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.0 0.00011549999999999999 0.3 AML other m 2020-08-27T04:08:03.35
IV.NRCA.HHN. ML:0.8 0.0000737 0.16 AML other m 2020-08-27T04:08:03.89
IV.SMA1.EHE. ML:0.6 0.0000316 1.8 AML other m 2020-08-27T04:08:05.05
IV.SMA1.EHN. ML:0.6 0.0000291 1.42 AML other m 2020-08-27T04:08:05.19
IV.NRCA.HNE. ML:1.0 0.00011408715 0.2912 AML other m 2020-08-27T04:08:03.50
IV.RM33.EHE. ML:0.3 0.0000112330425 0.2016 AML other m 2020-08-27T04:08:08.13
IV.RM33.EHN. ML:0.4 0.000017213665 0.16 AML other m 2020-08-27T04:08:07.77
IV.FDMO.HHE. ML:0.1 0.0000061062185 0.1184 AML other m 2020-08-27T04:08:09.26
IV.FDMO.HHN. ML:0.1 0.0000057790515 0.1184 AML other m 2020-08-27T04:08:09.39
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