Earthquake with magnitude of ML 1.5 on date 04-08-2020 and time 13:40:59 (UTC) in region 1 km S Massa Martana (PG)

A magnitude ML 1.5 earthquake occured in region: 1 km S Massa Martana (PG), on

  • 04-08-2020 13:40:59 (UTC)
  • 04-08-2020 15:40:59 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.77, 12.53 at 9 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
Massa Martana PG 1 3770 3770
Giano dell'Umbria PG 9 3846 7616
Acquasparta TR 9 4778 12394
Todi PG 10 16851 29245
Montecastrilli TR 13 5022 34267
Castel Ritaldi PG 14 3278 37545
Avigliano Umbro TR 15 2558 40103
Collazzone PG 16 3473 43576
Gualdo Cattaneo PG 16 6155 49731
Monte Castello di Vibio PG 16 1567 51298
Fratta Todina PG 16 1839 53137
San Gemini TR 17 5018 58155
Montefalco PG 18 5679 63834
Spoleto PG 18 38218 102052
Bevagna PG 20 5081 107133

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km NW of Terni (111501 inhabitants)
26 Km SW of Foligno (57155 inhabitants)
39 Km S of Perugia (166134 inhabitants)
52 Km NE of Viterbo (67173 inhabitants)
85 Km NW of L'Aquila (69753 inhabitants)
87 Km N of Guidonia Montecelio (88673 inhabitants)
92 Km N of Tivoli (56533 inhabitants)
94 Km SE of Arezzo (99543 inhabitants)
96 Km NE of Civitavecchia (52991 inhabitants)
97 Km W of Teramo (54892 inhabitants)
97 Km N of Roma (2864731 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 1.5 2020-08-04
13:40:59
42.77 12.53 9 2020-08-04
13:48:38
Sala Sismica INGV-Roma 81643061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-04 13:40:59 ± 0.06
Latitude 42.77 ± 0.00
Longitude 12.53 ± 0.01
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 81643061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 603
Semi-minor axis of confidence ellipse (meter) 321
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 82
Circular confidence region, given by single value of horizontal uncertainty (meter) 600
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 132
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.04856
Epicentral distance of station farthest from the epicenter (degree) 0.33635
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 81643061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-04 13:48:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MGAB.HHZ. 2020-08-04T13:41:12.38 0.6 undecidable manual S 296 0.3363 50 0.01 48
IV.ASSB.HHZ. 2020-08-04T13:41:11.05 0.6 undecidable manual S 19 0.2914 50 0 49
IV.ARRO.EHZ. 2020-08-04T13:41:09.61 0.6 undecidable manual S 137 0.2581 107 -0.28 46
IV.ASSB.HHZ. 2020-08-04T13:41:06.19 0.3 undecidable manual P 19 0.2914 50 0.03 73
IV.CESX.HHZ. 2020-08-04T13:41:06.52 0.6 undecidable manual S 164 0.1655 116 -0.05 50
IV.MGAB.HHZ. 2020-08-04T13:41:06.72 0.3 undecidable manual P 296 0.3363 50 -0.2 70
IV.ARRO.EHZ. 2020-08-04T13:41:05.62 0.3 undecidable manual P 137 0.2581 107 0.13 72
IT.GNU.HGE. 2020-08-04T13:41:03.04 0.3 undecidable manual S 42 0.0486 149 -0.08 76
IV.CESX.HHZ. 2020-08-04T13:41:03.77 0.6 negative manual P 164 0.1655 116 0.2 48
IV.MOMA.HHZ. 2020-08-04T13:41:02.87 0.6 undecidable manual S 42 0.0486 149 -0.25 49
IV.MOMA.HHZ. 2020-08-04T13:41:01.72 0.1 positive manual P 42 0.0486 149 0.14 100
IT.GNU.HGE. 2020-08-04T13:41:01.70 0.1 undecidable manual P 42 0.0486 149 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.9 0.001577158 0.1216 AML other m 2020-08-04T13:41:03.52
IV.MOMA.HHN. ML:1.7 0.00087307695 0.2176 AML other m 2020-08-04T13:41:04.32
IV.MOMA.HNE. ML:1.9 0.001475703 0.1216 AML other m 2020-08-04T13:41:03.52
IV.MOMA.HNN. ML:1.6 0.00077159395 0.2176 AML other m 2020-08-04T13:41:04.43
IV.CESX.HHE. ML:1.1 0.000111767165 0.3968 AML other m 2020-08-04T13:41:08.96
IV.CESX.HHN. ML:1.2 0.00013616135 0.1984 AML other m 2020-08-04T13:41:08.95
IV.ARRO.EHE. ML:1.2 8.789653E-5 0.224 AML other m 2020-08-04T13:41:10.32
IV.ARRO.EHN. ML:1.2 8.9433005E-5 0.1792 AML other m 2020-08-04T13:41:11.69
IV.ASSB.HHE. ML:0.9 3.6998295E-5 0.0768 AML other m 2020-08-04T13:41:12.10
IV.ASSB.HHN. ML:0.8 3.0050685E-5 0.2048 AML other m 2020-08-04T13:41:11.26
IV.MGAB.HHE. ML:1.3 8.0609765E-5 0.4032 AML other m 2020-08-04T13:41:14.66
IV.MGAB.HHN. ML:1.5 0.00013201353 0.16 AML other m 2020-08-04T13:41:12.90
IV.MGAB.HNE. ML:1.7 0.00017642905 0.8448 AML other m 2020-08-04T13:41:16.68
IV.MGAB.HNN. ML:1.6 0.0001513515 0.3584 AML other m 2020-08-04T13:41:12.90
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