The microtremor H/V spectral ratio is the ratio of the horizontal component to the vertical component of the ambient seismic noise at different frequencies. recorded at the earth surface. In the field of engineering earthquake. V and H are usually used to denote the vertical and horizontal components of the microtremor. https://www.ealisboa.com/best-buy-Freya-Viva-La-Fiesta-Plunge-Bikini-Top-Multi-great-buy/