Earthquake with magnitude of ML 1.0 on date 27-09-2021 and time 11:37:04 (Italy) in region 9 km E San Giovanni Rotondo (FG)

A magnitude ML 1.0 earthquake occured in region: 9 km E San Giovanni Rotondo (FG), on

  • 27-09-2021 09:37:04 (UTC)
  • 27-09-2021 11:37:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.72, 15.84 at 18 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
San Giovanni Rotondo FG 9 27184 27184
Monte Sant'Angelo FG 10 12657 39841
Manfredonia FG 12 57279 97120
Cagnano Varano FG 13 7330 104450
Carpino FG 14 4182 108632
San Marco in Lamis FG 17 13831 122463
Mattinata FG 18 6310 128773

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km NW of Manfredonia (57279 inhabitants)
38 Km NE of Foggia (151991 inhabitants)
38 Km E of San Severo (53905 inhabitants)
51 Km N of Cerignola (58396 inhabitants)
58 Km NW of Barletta (94814 inhabitants)
67 Km NW of Andria (100440 inhabitants)
69 Km NW of Trani (56217 inhabitants)
77 Km NW of Bisceglie (55422 inhabitants)
85 Km NW of Molfetta (59874 inhabitants)
98 Km NW of Bitonto (55540 inhabitants)
Recent and historical seismicity
Seismic hazard
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 ( 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
ML 1.0 2021-09-27
41.7198 15.8395 18 2021-09-27
Sala Sismica INGV-Roma 95939281
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-09-27 09:37:04 ± 0.36
Latitude 41.7198 ± 0.0288
Longitude 15.8395 ± 0.0181
Depth (km) 18 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95939281


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 3332
Semi-minor axis of confidence ellipse (meter) 634
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 22
Circular confidence region, given by single value of horizontal uncertainty (meter) 3330
Confidence level of the uncertainty (%) 68


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 9
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.19335
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 5
Magnitude information


Field Value
Value 1
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 95939281
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-27 09:47:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IT.PLTA.HNZ. 2021-09-27T09:37:19.66 3.0 undecidable manual P 0 0
OT.OT04.EHE. 2021-09-27T09:37:13.47 0.6 undecidable manual S 270 0.1934 121 -0.25 46
IV.SGRT.HHZ. 2021-09-27T09:37:11.45 0.6 undecidable manual S 296 0.0791 150 0.13 50
IV.MSAG.HHZ. 2021-09-27T09:37:10.96 0.6 undecidable manual S 99 0.0531 159 -0.02 50
OT.OT05.EHE. 2021-09-27T09:37:10.24 0.1 undecidable manual P 251 0.1871 122 0.32 96
OT.OT04.EHE. 2021-09-27T09:37:09.81 0.1 undecidable manual P 270 0.1934 121 -0.19 93
OT.OT12.EHZ. 2021-09-27T09:37:08.82 0.6 negative manual P 150 0.1016 143 -0.01 49
IV.MSAG.HHZ. 2021-09-27T09:37:08.37 0.6 undecidable manual P 99 0.0531 159 -0.05 50
IV.SGRT.HHZ. 2021-09-27T09:37:08.62 0.1 undecidable manual P 296 0.0791 150 0 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
OT.OT12.EHN. ML:1.1 0.00010315 1.4 AML other m 2021-09-27T09:37:10.75
OT.OT12.EHE. ML:1.1 9.02E-5 0.36 AML other m 2021-09-27T09:37:10.01
IV.SGRT.HHE. ML:1.1 9.565E-5 0.44 AML other m 2021-09-27T09:37:11.94
IV.SGRT.HHN. ML:1.1 0.0001115 0.16 AML other m 2021-09-27T09:37:11.70
IV.MSAG.HHN. ML:0.8 5.79E-5 0.6 AML other m 2021-09-27T09:37:11.85
IV.MSAG.HHE. ML:0.5 2.87E-5 0.48 AML other m 2021-09-27T09:37:14.85
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download