Earthquake with magnitude of ML 1.2 on date 23-08-2018 and time 15:33:30 (Italy) in region 2 km W Cerreto di Spoleto (PG)

A magnitude ML 1.2 earthquake occured in region: 2 km W Cerreto di Spoleto (PG), on

  • 23-08-2018 13:33:30 (UTC)
  • 23-08-2018 15:33:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.81, 12.9 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Cerreto di Spoleto PG 2 1075 1075
Vallo di Nera PG 6 364 1439
Sellano PG 9 1079 2518
Campello sul Clitunno PG 10 2442 4960
Sant'Anatolia di Narco PG 10 564 5524
Poggiodomo PG 12 117 5641
Scheggino PG 12 461 6102
Preci PG 14 724 6826
Trevi PG 14 8469 15295
Cascia PG 14 3217 18512
Spoleto PG 16 38218 56730
Norcia PG 16 4957 61687
Castel Ritaldi PG 18 3278 64965
Monteleone di Spoleto PG 19 599 65564

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SE of Foligno (57155 inhabitants)
35 Km NE of Terni (111501 inhabitants)
53 Km SE of Perugia (166134 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
68 Km W of Teramo (54892 inhabitants)
78 Km NE of Viterbo (67173 inhabitants)
91 Km N of Guidonia Montecelio (88673 inhabitants)
95 Km N 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
Rev 100 ML 1.2 2018-08-23
13:33:30
42.81 12.9 10 2018-08-23
13:37:39
Sala Sismica INGV-Roma 60128831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-08-23 13:33:30 ± 0.09
Latitude 42.81 ± 0.00
Longitude 12.90 ± 0.01
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 60128831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 585
Semi-minor axis of confidence ellipse (meter) 308
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 85
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) 160
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 12
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
Epicentral distance of station farthest from the epicenter (degree) 0.5369
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 15
Type of magnitude ML
Reference to an origin 60128831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-08-23 13:37:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.APEC.HHZ. 2018-08-23T13:33:55.75 3.0 undecidable manual S -3.49 0
IV.EL6.EHZ. 2018-08-23T13:33:49.25 0.3 undecidable manual S 16 0.5369 50 0.4 65
IV.RM33.EHZ. 2018-08-23T13:33:44.47 0.3 undecidable manual S 142 0.384 50 0.16 71
IV.EL6.EHZ. 2018-08-23T13:33:41.00 0.1 undecidable manual P 16 0.5369 50 0.01 95
IV.ARRO.EHZ. 2018-08-23T13:33:40.27 0.3 undecidable manual S 202 0.2536 50 -0.17 73
IV.FDMO.HHZ. 2018-08-23T13:33:40.38 0.3 undecidable manual S 32 0.2626 50 -0.35 70
IV.CESI.HHZ. 2018-08-23T13:33:38.32 0.3 undecidable manual S 2 0.1916 115 -0.11 74
IV.RM33.EHZ. 2018-08-23T13:33:38.28 0.1 undecidable manual P 142 0.384 50 -0.09 96
IV.NRCA.HHZ. 2018-08-23T13:33:37.31 0.3 undecidable manual S 83 0.161 119 -0.07 75
IV.FDMO.HHZ. 2018-08-23T13:33:36.20 0.6 positive manual P 32 0.2626 50 -0.11 49
IV.ARRO.EHZ. 2018-08-23T13:33:36.23 0.1 undecidable manual P 202 0.2536 50 0.09 98
IV.CESI.HHZ. 2018-08-23T13:33:35.05 0.1 undecidable manual P 2 0.1916 115 0.07 100
IV.NRCA.HHZ. 2018-08-23T13:33:34.47 0.1 negative manual P 83 0.161 119 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
OB.GAVE.EHE. ML:0 0.000268 0.14 AML other m 2018-08-23T13:33:36.85
OB.GAVE.EHN. ML:0 0.0002695 0.2 AML other m 2018-08-23T13:33:37.28
IV.LNSS.HHE. ML:0 9.595E-5 1.1 AML other m 2018-08-23T13:33:40.66
IV.LNSS.HHN. ML:0 9.995E-5 0.48 AML other m 2018-08-23T13:33:40.60
IV.NRCA.HHN. ML:1.2 0.000128465 0.0576 AML other m 2018-08-23T13:33:37.49
IV.NRCA.HHE. ML:1.4 0.0001964922 0.1216 AML other m 2018-08-23T13:33:37.50
IV.NRCA.HNE. ML:1.3 0.000170376335 0.1216 AML other m 2018-08-23T13:33:37.50
IV.CESI.HHN. ML:1.6 0.00025313105 0.1856 AML other m 2018-08-23T13:33:38.59
IV.CESI.HHE. ML:1.2 0.000114139975 0.0832 AML other m 2018-08-23T13:33:38.53
IV.FDMO.HHE. ML:1.2 7.260909E-5 0.2048 AML other m 2018-08-23T13:33:41.19
IV.FDMO.HHN. ML:1 4.3658555E-5 0.16 AML other m 2018-08-23T13:33:40.87
IV.ARRO.EHN. ML:1 5.3546185E-5 0.16 AML other m 2018-08-23T13:33:41.85
IV.ARRO.EHE. ML:0.8 3.723732E-5 0.16 AML other m 2018-08-23T13:33:41.27
IV.RM33.HNN. ML:1.7 0.0001529279 1.1584 AML other m 2018-08-23T13:33:43.90
IV.RM33.HNE. ML:1.6 0.000129389785 0.8384 AML other m 2018-08-23T13:33:38.95
IV.RM33.EHN. ML:0.8 2.0546875E-5 0.1984 AML other m 2018-08-23T13:33:44.84
IV.RM33.EHE. ML:0.8 2.1367915E-5 0.1984 AML other m 2018-08-23T13:33:46.00
IV.EL6.EHN. ML:1.2 3.382812E-5 0.256 AML other m 2018-08-23T13:33:50.57
IV.EL6.EHE. ML:1.1 2.7470865E-5 0.2176 AML other m 2018-08-23T13:33:50.08
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