@article{fdi:010075649,
  title = {{C}omment on "{E}arthquake-induced prompt gravity signals identified in dense array data in {J}apan" by {K}imura et al},
  author = {{V}all{\'e}e, {M}. and {A}mpuero, {J}ean-{P}aul and {J}uhel, {K}. and {B}ernard, {P}. and {M}ontagner, {J}. {P}. and {B}arsuglia, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} recent work by {K}imura et al. ({E}arth {P}lanets {S}pace 71:27, 2019. 10.1186/s40623-019-1006-x) (hereafter referred to as {K}19) claims to provide the first observational constraints on the prompt elastogravity signals ({PEGS}) induced by an earthquake. {T}o make their claim, the authors argue that the observations shown in {V}allee et al. ({S}cience 358:1164-1168, 2017. 10.1126/science.aao0746) (hereafter referred to as {V}17) are spurious and their modeling inaccurate. {H}ere we show that {K}19's claim is invalid because it is based on flawed data processing. {I}n fact, {K}19's analysis involves an incomplete correction of the instrument response of broadband seismic sensors, which essentially dismisses low-frequency components of the data that are critical for the detection of intrinsically low-frequency signals such as {PEGS}. {A}s a direct consequence, signals are much more difficult to observe than in {V}17, where the low part of the signal spectrum is carefully taken into account. {T}his deficient data processing also explains why the signal amplitude reported by {K}19 after stacking data from multiple stations is lower than the individual signals reported by {V}17. {M}oreover, failing to take appropriate measures of data quality control, {K}19 used signals from low-quality sensors to call into question the signals detected by high-quality sensors. {F}inally, {K}19 use an inadequate simulation approach to model {PEGS}, in which the important effect of the ground acceleration induced by gravity changes is ignored. {I}n summary, {K}19 do not show any viable arguments to question the observations and modeling of {PEGS} presented in {V}17.},
  keywords = {{P}rompt elastogravity signals ; {T}ohoku earthquake ; {I}nstrument response ; {N}oise levels ; {JAPON}},
  booktitle = {},
  journal = {{E}arth {P}lanets and {S}pace},
  volume = {71},
  numero = {},
  pages = {51 [6 ]},
  ISSN = {1880-5981},
  year = {2019},
  DOI = {10.1186/s40623-019-1030-x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010075649},
}