Earthquake with magnitude of ML 1.0 on date 05-08-2020 and time 01:43:45 (Italy) in region 5 km NW Arquata del Tronto (AP)

A magnitude ML 1.0 earthquake occured in region: 5 km NW Arquata del Tronto (AP), on

  • 04-08-2020 23:43:45 (UTC)
  • 05-08-2020 01:43:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8, 13.25 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.

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 5 1178 1178
Montegallo AP 8 523 1701
Accumoli RI 12 667 2368
Montemonaco AP 13 604 2972
Acquasanta Terme AP 13 2916 5888
Norcia PG 13 4957 10845
Castelsantangelo sul Nera MC 13 281 11126
Montefortino FM 18 1178 12304
Ussita MC 19 444 12748
Amatrice RI 19 2657 15405
Roccafluvione AP 19 2010 17415
Preci PG 20 724 18139
Visso MC 20 1107 19246

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km W of Teramo (54892 inhabitants)
48 Km E of Foligno (57155 inhabitants)
51 Km N of L'Aquila (69753 inhabitants)
56 Km E of Terni (111501 inhabitants)
78 Km E of Perugia (166134 inhabitants)
80 Km W of Montesilvano (53738 inhabitants)
87 Km W of Pescara (121014 inhabitants)
90 Km NW of Chieti (51815 inhabitants)
93 Km S of Ancona (100861 inhabitants)
99 Km NE of Guidonia Montecelio (88673 inhabitants)
100 Km NE of Tivoli (56533 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 1.0 2020-08-04
23:43:45
42.8 13.25 11 2020-08-04
23:58:16
Sala Sismica INGV-Roma 81658901
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-04 23:43:45 ± 0.07
Latitude 42.80 ± 0.01
Longitude 13.25 ± 0.00
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 81658901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 575
Semi-minor axis of confidence ellipse (meter) 405
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 11
Circular confidence region, given by single value of horizontal uncertainty (meter) 580
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 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.10792
Epicentral distance of station farthest from the epicenter (degree) 0.31206
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 81658901
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-04 23:58:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2020-08-04T23:43:57.44 0.1 undecidable manual S 125 0.3121 50 -0.15 94
IV.SMA1.EHZ. 2020-08-04T23:43:53.86 0.1 undecidable manual S 161 0.1799 50 0.19 96
IV.TERO.HHZ. 2020-08-04T23:43:52.60 1.0 negative manual P 125 0.3121 50 -0.02 24
IV.MC2.EHZ. 2020-08-04T23:43:51.99 0.1 undecidable manual S 337 0.1214 129 0.15 97
IV.MMO1.EHZ. 2020-08-04T23:43:51.50 0.1 undecidable manual S 28 0.1124 131 -0.08 99
IV.NRCA.HHZ. 2020-08-04T23:43:51.25 0.1 undecidable manual S 288 0.1079 132 -0.21 96
IV.MTRA.EHZ. 2020-08-04T23:43:51.58 0.1 undecidable manual S 113 0.1133 131 -0.02 100
IV.RM33.EHZ. 2020-08-04T23:43:51.65 1.0 undecidable manual P 186 0.2923 50 -0.64 21
IV.SMA1.EHZ. 2020-08-04T23:43:50.41 0.6 positive manual P 161 0.1799 50 0.04 49
IV.MTRA.EHZ. 2020-08-04T23:43:49.45 0.6 undecidable manual P 113 0.1133 131 0.28 47
IV.MC2.EHZ. 2020-08-04T23:43:49.49 0.6 positive manual P 337 0.1214 129 0.19 48
IV.MMO1.EHZ. 2020-08-04T23:43:49.11 0.1 undecidable manual P 28 0.1124 131 -0.05 100
IV.NRCA.HHZ. 2020-08-04T23:43:49.19 0.1 undecidable manual P 288 0.1079 132 0.1 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.1 0.000139 0.14 AML other m 2020-08-04T23:43:51.73
IV.NRCA.HHE. ML:0.9 8.92E-5 1.78 AML other m 2020-08-04T23:43:52.93
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download